20972572 has 6 divisors (see below), whose sum is σ = 36702008. Its totient is φ = 10486284.

The previous prime is 20972537. The next prime is 20972579. The reversal of 20972572 is 27527902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2621568 + ... + 2621575.

Almost surely, 2^20972572 is an apocalyptic number.

It is an amenable number.

20972572 is a deficient number, since it is larger than the sum of its proper divisors (15729436).

20972572 is a wasteful number, since it uses less digits than its factorization.

20972572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243147 (or 5243145 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20972572 is about 4579.5820770022. The cubic root of 20972572 is about 275.7722513824.

The spelling of 20972572 in words is "twenty million, nine hundred seventy-two thousand, five hundred seventy-two".