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21232020 = 2235353867
BaseRepresentation
bin101000011111…
…1100110010100
31110221200212010
41100333212110
520413411040
62035024220
7345316635
oct120774624
943850763
1021232020
1110a91a27
12713b070
134525134
142b6988c
151ce5e80
hex143f994

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".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 353867 707734 1061601 1415468 1769335 2123202 3538670 4246404 5308005 7077340 10616010 21232020