20972895 has 64 divisors (see below), whose sum is σ = 37822464. Its totient is φ = 9884160.

The previous prime is 20972873. The next prime is 20972899. The reversal of 20972895 is 59827902.

It is not a de Polignac number, because 20972895 - 2⁸ = 20972639 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972899) 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, 395689 + ... + 395741.

It is an arithmetic number, because the mean of its divisors is an integer number (590976).

Almost surely, 2^20972895 is an apocalyptic number.

20972895 is a deficient number, since it is larger than the sum of its proper divisors (16849569).

20972895 is a wasteful number, since it uses less digits than its factorization.

20972895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 20972895 is about 4579.6173420931. The cubic root of 20972895 is about 275.7736671042.

The spelling of 20972895 in words is "twenty million, nine hundred seventy-two thousand, eight hundred ninety-five".