20972394 has 24 divisors (see below), whose sum is σ = 47008260. Its totient is φ = 6749568.

The previous prime is 20972383. The next prime is 20972417. The reversal of 20972394 is 49327902.

It can be written as a sum of positive squares in 2 ways, for example, as 19316025 + 1656369 = 4395^2 + 1287^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19567 + ... + 20610.

Almost surely, 2^20972394 is an apocalyptic number.

20972394 is an abundant number, since it is smaller than the sum of its proper divisors (26035866).

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

20972394 is a wasteful number, since it uses less digits than its factorization.

20972394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40214 (or 40211 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20972394 is about 4579.5626428732. The cubic root of 20972394 is about 275.7714711952.

The spelling of 20972394 in words is "twenty million, nine hundred seventy-two thousand, three hundred ninety-four".