20973672 has 48 divisors (see below), whose sum is σ = 58346340. Its totient is φ = 6801408.

The previous prime is 20973653. The next prime is 20973679. The reversal of 20973672 is 27637902.

It can be written as a sum of positive squares in 2 ways, for example, as 20848356 + 125316 = 4566^2 + 354^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20973679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1273 + ... + 6600.

Almost surely, 2^20973672 is an apocalyptic number.

It is an amenable number.

20973672 is an abundant number, since it is smaller than the sum of its proper divisors (37372668).

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

20973672 is a wasteful number, since it uses less digits than its factorization.

20973672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7922 (or 7915 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 20973672 is about 4579.7021737227. The cubic root of 20973672 is about 275.7770726664. Note that the first 3 decimals are identical.

The spelling of 20973672 in words is "twenty million, nine hundred seventy-three thousand, six hundred seventy-two".