20108972 has 36 divisors (see below), whose sum is σ = 38552976. Its totient is φ = 9172800.

The previous prime is 20108951. The next prime is 20108981. The reversal of 20108972 is 27980102.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101978 + ... + 102174.

It is an arithmetic number, because the mean of its divisors is an integer number (1070916).

Almost surely, 2^20108972 is an apocalyptic number.

It is an amenable number.

20108972 is a deficient number, since it is larger than the sum of its proper divisors (18444004).

20108972 is a wasteful number, since it uses less digits than its factorization.

20108972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20108972 is about 4484.3028443672. The cubic root of 20108972 is about 271.9338615145.

The spelling of 20108972 in words is "twenty million, one hundred eight thousand, nine hundred seventy-two".