20972190 has 16 divisors (see below), whose sum is σ = 50333328. Its totient is φ = 5592576.

The previous prime is 20972179. The next prime is 20972221. The reversal of 20972190 is 9127902.

It is a super-2 number, since 2×20972190² = 879665506792200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 699073 = 20972190 / (2 + 0 + 9 + 7 + 2 + 1 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349507 + ... + 349566.

It is an arithmetic number, because the mean of its divisors is an integer number (3145833).

Almost surely, 2^20972190 is an apocalyptic number.

20972190 is an abundant number, since it is smaller than the sum of its proper divisors (29361138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20972190 is a wasteful number, since it uses less digits than its factorization.

20972190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699083.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 20972190 is about 4579.5403699498. The cubic root of 20972190 is about 275.7705770426.

The spelling of 20972190 in words is "twenty million, nine hundred seventy-two thousand, one hundred ninety".