20952720 has 60 divisors (see below), whose sum is σ = 70368636. Its totient is φ = 5587200.

The previous prime is 20952719. The next prime is 20952731. The reversal of 20952720 is 2725902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2702736 + 18249984 = 1644^2 + 4272^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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, 13831 + ... + 15270.

Almost surely, 2^20952720 is an apocalyptic number.

20952720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20952720 is an abundant number, since it is smaller than the sum of its proper divisors (49415916).

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

20952720 is a wasteful number, since it uses less digits than its factorization.

20952720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29120 (or 29111 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20952720 is about 4577.4141171627. The cubic root of 20952720 is about 275.6852113663.

The spelling of 20952720 in words is "twenty million, nine hundred fifty-two thousand, seven hundred twenty".