21934020 has 24 divisors (see below), whose sum is σ = 61415424. Its totient is φ = 5849056.

The previous prime is 21934013. The next prime is 21934039. The reversal of 21934020 is 2043912.

It is a super-2 number, since 2×21934020² = 962202466720800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182724 + ... + 182843.

It is an arithmetic number, because the mean of its divisors is an integer number (2558976).

Almost surely, 2^21934020 is an apocalyptic number.

21934020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21934020 is an abundant number, since it is smaller than the sum of its proper divisors (39481404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21934020 is a wasteful number, since it uses less digits than its factorization.

21934020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365579 (or 365577 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21934020 is about 4683.3769867479. The cubic root of 21934020 is about 279.9235335411.

Adding to 21934020 its reverse (2043912), we get a palindrome (23977932).

The spelling of 21934020 in words is "twenty-one million, nine hundred thirty-four thousand, twenty".