Base | Representation |
---|---|
bin | 101000011111… |
… | …1100110010100 |
3 | 1110221200212010 |
4 | 1100333212110 |
5 | 20413411040 |
6 | 2035024220 |
7 | 345316635 |
oct | 120774624 |
9 | 43850763 |
10 | 21232020 |
11 | 10a91a27 |
12 | 713b070 |
13 | 4525134 |
14 | 2b6988c |
15 | 1ce5e80 |
hex | 143f994 |
21232020 has 24 divisors (see below), whose sum is σ = 59449824. Its totient is φ = 5661856.
The previous prime is 21232007. The next prime is 21232033. The reversal of 21232020 is 2023212.
It is an interprime number because it is at equal distance from previous prime (21232007) and next prime (21232033).
It is a Harshad number since it is a multiple of its sum of digits (12).
It is a junction number, because it is equal to n+sod(n) for n = 21231987 and 21232005.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176874 + ... + 176993.
It is an arithmetic number, because the mean of its divisors is an integer number (2477076).
Almost surely, 221232020 is an apocalyptic number.
21232020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
21232020 is an abundant number, since it is smaller than the sum of its proper divisors (38217804).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21232020 is a wasteful number, since it uses less digits than its factorization.
21232020 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 353879 (or 353877 counting only the distinct ones).
The product of its (nonzero) digits is 48, while the sum is 12.
The square root of 21232020 is about 4607.8216111304. The cubic root of 21232020 is about 276.9047707509.
Adding to 21232020 its reverse (2023212), we get a palindrome (23255232).
The spelling of 21232020 in words is "twenty-one million, two hundred thirty-two thousand, twenty".
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