20964972 has 24 divisors (see below), whose sum is σ = 55906816. Its totient is φ = 5989968.

The previous prime is 20964971. The next prime is 20964989. The reversal of 20964972 is 27946902.

It is a self number, because there is not a number n which added to its sum of digits gives 20964972.

It is not an unprimeable number, because it can be changed into a prime (20964971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124708 + ... + 124875.

Almost surely, 2^20964972 is an apocalyptic number.

It is an amenable number.

20964972 is an abundant number, since it is smaller than the sum of its proper divisors (34941844).

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

20964972 is a wasteful number, since it uses less digits than its factorization.

20964972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249597 (or 249595 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 20964972 is about 4578.7522317767. The cubic root of 20964972 is about 275.7389360865.

The spelling of 20964972 in words is "twenty million, nine hundred sixty-four thousand, nine hundred seventy-two".