Base | Representation |
---|---|
bin | 100111100010… |
… | …1010101011000 |
3 | 1110000020220010 |
4 | 1033011111120 |
5 | 20301344344 |
6 | 2020201520 |
7 | 341132613 |
oct | 117052530 |
9 | 43006803 |
10 | 20731224 |
11 | 1077a748 |
12 | 6b392a0 |
13 | 43ab1c7 |
14 | 2a7917a |
15 | 1c478b9 |
hex | 13c5558 |
20731224 has 16 divisors (see below), whose sum is σ = 51828120. Its totient is φ = 6910400.
The previous prime is 20731189. The next prime is 20731231. The reversal of 20731224 is 42213702.
It is a self number, because there is not a number n which added to its sum of digits gives 20731224.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431877 + ... + 431924.
Almost surely, 220731224 is an apocalyptic number.
20731224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.
It is an amenable number.
20731224 is an abundant number, since it is smaller than the sum of its proper divisors (31096896).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20731224 is a wasteful number, since it uses less digits than its factorization.
20731224 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 863810 (or 863806 counting only the distinct ones).
The product of its (nonzero) digits is 672, while the sum is 21.
The square root of 20731224 is about 4553.1553893976. The cubic root of 20731224 is about 274.7103241734.
Adding to 20731224 its reverse (42213702), we get a palindrome (62944926).
It can be divided in two parts, 2073 and 1224, that multiplied together give a palindrome (2537352).
The spelling of 20731224 in words is "twenty million, seven hundred thirty-one thousand, two hundred twenty-four".
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