20992725 has 36 divisors (see below), whose sum is σ = 40498276. Its totient is φ = 10333440.

The previous prime is 20992711. The next prime is 20992747. The reversal of 20992725 is 52729902.

It can be written as a sum of positive squares in 6 ways, for example, as 116964 + 20875761 = 342^2 + 4569^2 .

It is not a de Polignac number, because 20992725 - 2⁵ = 20992693 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20992725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 664 + ... + 6513.

Almost surely, 2^20992725 is an apocalyptic number.

20992725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20992725 is a deficient number, since it is larger than the sum of its proper divisors (19505551).

20992725 is a wasteful number, since it uses less digits than its factorization.

20992725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7206 (or 7198 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20992725 is about 4581.7818586223. The cubic root of 20992725 is about 275.8605549531.

The spelling of 20992725 in words is "twenty million, nine hundred ninety-two thousand, seven hundred twenty-five".