20915937 has 12 divisors (see below), whose sum is σ = 34528000. Its totient is φ = 11951928.

The previous prime is 20915929. The next prime is 20915953. The reversal of 20915937 is 73951902.

It is not a de Polignac number, because 20915937 - 2³ = 20915929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20915957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165937 + ... + 166062.

Almost surely, 2^20915937 is an apocalyptic number.

It is an amenable number.

20915937 is a deficient number, since it is larger than the sum of its proper divisors (13612063).

20915937 is a wasteful number, since it uses less digits than its factorization.

20915937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332012 (or 332009 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 20915937 is about 4573.3944723804. The cubic root of 20915937 is about 275.5237928821.

The spelling of 20915937 in words is "twenty million, nine hundred fifteen thousand, nine hundred thirty-seven".