20625720 has 32 divisors (see below), whose sum is σ = 61877520. Its totient is φ = 5500160.

The previous prime is 20625707. The next prime is 20625721. The reversal of 20625720 is 2752602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85821 + ... + 86060.

Almost surely, 2^20625720 is an apocalyptic number.

20625720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20625720 is an abundant number, since it is smaller than the sum of its proper divisors (41251800).

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

20625720 is a wasteful number, since it uses less digits than its factorization.

20625720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171895 (or 171891 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20625720 is about 4541.5547998455. The cubic root of 20625720 is about 274.2435187447.

The spelling of 20625720 in words is "twenty million, six hundred twenty-five thousand, seven hundred twenty".