20916664 has 48 divisors (see below), whose sum is σ = 42550200. Its totient is φ = 9635328.

The previous prime is 20916589. The next prime is 20916673. The reversal of 20916664 is 46661902.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

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, 191842 + ... + 191950.

Almost surely, 2^20916664 is an apocalyptic number.

It is an amenable number.

20916664 is an abundant number, since it is smaller than the sum of its proper divisors (21633536).

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

20916664 is a wasteful number, since it uses less digits than its factorization.

20916664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20916664 is about 4573.4739531345. The cubic root of 20916664 is about 275.5269850808.

The spelling of 20916664 in words is "twenty million, nine hundred sixteen thousand, six hundred sixty-four".