20972380 has 48 divisors (see below), whose sum is σ = 51748704. Its totient is φ = 7038720.

The previous prime is 20972359. The next prime is 20972381. The reversal of 20972380 is 8327902.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807 + ... + 6526.

It is an arithmetic number, because the mean of its divisors is an integer number (1078098).

Almost surely, 2^20972380 is an apocalyptic number.

20972380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20972380 is an abundant number, since it is smaller than the sum of its proper divisors (30776324).

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

20972380 is a wasteful number, since it uses less digits than its factorization.

20972380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7366 (or 7364 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20972380 is about 4579.5611143427. The cubic root of 20972380 is about 275.7714098319.

The spelling of 20972380 in words is "twenty million, nine hundred seventy-two thousand, three hundred eighty".