20328972 has 12 divisors (see below), whose sum is σ = 47434296. Its totient is φ = 6776320.

The previous prime is 20328953. The next prime is 20328983. The reversal of 20328972 is 27982302.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847029 + ... + 847052.

It is an arithmetic number, because the mean of its divisors is an integer number (3952858).

Almost surely, 2^20328972 is an apocalyptic number.

It is an amenable number.

20328972 is an abundant number, since it is smaller than the sum of its proper divisors (27105324).

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

20328972 is a wasteful number, since it uses less digits than its factorization.

20328972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694088 (or 1694086 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20328972 is about 4508.7661283327. The cubic root of 20328972 is about 272.9219543705.

The spelling of 20328972 in words is "twenty million, three hundred twenty-eight thousand, nine hundred seventy-two".