20972872 has 16 divisors (see below), whose sum is σ = 41034240. Its totient is φ = 10030416.

The previous prime is 20972867. The next prime is 20972873. The reversal of 20972872 is 27827902.

It is a super-2 number, since 2×20972872² = 879722719856768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20972873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56808 + ... + 57175.

It is an arithmetic number, because the mean of its divisors is an integer number (2564640).

Almost surely, 2^20972872 is an apocalyptic number.

It is an amenable number.

20972872 is a deficient number, since it is larger than the sum of its proper divisors (20061368).

20972872 is a wasteful number, since it uses less digits than its factorization.

20972872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114012 (or 114008 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20972872 is about 4579.6148309656. The cubic root of 20972872 is about 275.7735662948.

The spelling of 20972872 in words is "twenty million, nine hundred seventy-two thousand, eight hundred seventy-two".