| Base | Representation |
|---|---|
| bin | 100110111110… |
| … | …0001100000100 |
| 3 | 1102110000220200 |
| 4 | 1031330030010 |
| 5 | 20212302440 |
| 6 | 2005530500 |
| 7 | 335444256 |
| oct | 115741404 |
| 9 | 42400820 |
| 10 | 20431620 |
| 11 | 10595640 |
| 12 | 6a13a30 |
| 13 | 4304a21 |
| 14 | 29dbcd6 |
| 15 | 1bd8c30 |
| hex | 137c304 |
20431620 has 144 divisors (see below), whose sum is σ = 71705088. Its totient is φ = 4654080.
The previous prime is 20431591. The next prime is 20431627. The reversal of 20431620 is 2613402.
It is a happy number.
20431620 is a `hidden beast` number, since 2 + 0 + 43 + 1 + 620 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 20431593 and 20431602.
It is not an unprimeable number, because it can be changed into a prime (20431627) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33357 + ... + 33963.
It is an arithmetic number, because the mean of its divisors is an integer number (497952).
Almost surely, 220431620 is an apocalyptic number.
20431620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20431620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35852544).
20431620 is an abundant number, since it is smaller than the sum of its proper divisors (51273468).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20431620 is a wasteful number, since it uses less digits than its factorization.
20431620 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 650 (or 645 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
The square root of 20431620 is about 4520.1349537376. The cubic root of 20431620 is about 273.3805424439.
It can be divided in two parts, 2043 and 1620, that added together give a palindrome (3663).
The spelling of 20431620 in words is "twenty million, four hundred thirty-one thousand, six hundred twenty".
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