20972523 has 64 divisors (see below), whose sum is σ = 36126720. Its totient is φ = 10627200.

The previous prime is 20972513. The next prime is 20972537. The reversal of 20972523 is 32527902.

It is a happy number.

It is not a de Polignac number, because 20972523 - 2⁸ = 20972267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20972513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 252640 + ... + 252722.

It is an arithmetic number, because the mean of its divisors is an integer number (564480).

Almost surely, 2^20972523 is an apocalyptic number.

20972523 is a deficient number, since it is larger than the sum of its proper divisors (15154197).

20972523 is a wasteful number, since it uses less digits than its factorization.

20972523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20972523 is about 4579.5767271660. The cubic root of 20972523 is about 275.7720366122.

The spelling of 20972523 in words is "twenty million, nine hundred seventy-two thousand, five hundred twenty-three".