20642916 has 36 divisors (see below), whose sum is σ = 56032368. Its totient is φ = 5897808.

The previous prime is 20642903. The next prime is 20642971. The reversal of 20642916 is 61924602.

It is a super-2 number, since 2×20642916² = 852259961966112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16966 + ... + 18141.

Almost surely, 2^20642916 is an apocalyptic number.

It is an amenable number.

20642916 is an abundant number, since it is smaller than the sum of its proper divisors (35389452).

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

20642916 is a wasteful number, since it uses less digits than its factorization.

20642916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35128 (or 35119 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20642916 is about 4543.4475896614. The cubic root of 20642916 is about 274.3197113428.

The spelling of 20642916 in words is "twenty million, six hundred forty-two thousand, nine hundred sixteen".