20972624 has 10 divisors (see below), whose sum is σ = 40634490. Its totient is φ = 10486304.

The previous prime is 20972621. The next prime is 20972639. The reversal of 20972624 is 42627902.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 9412624 = 3400^2 + 3068^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655379 + ... + 655410.

It is an arithmetic number, because the mean of its divisors is an integer number (4063449).

Almost surely, 2^20972624 is an apocalyptic number.

It is an amenable number.

20972624 is a deficient number, since it is larger than the sum of its proper divisors (19661866).

20972624 is a wasteful number, since it uses less digits than its factorization.

20972624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310797 (or 1310791 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20972624 is about 4579.5877543727. The cubic root of 20972624 is about 275.7724793015.

The spelling of 20972624 in words is "twenty million, nine hundred seventy-two thousand, six hundred twenty-four".