20625660 has 108 divisors (see below), whose sum is σ = 68841864. Its totient is φ = 4994880.

The previous prime is 20625653. The next prime is 20625667. The reversal of 20625660 is 6652602.

It is an interprime number because it is at equal distance from previous prime (20625653) and next prime (20625667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625667) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21307 + ... + 22253.

Almost surely, 2^20625660 is an apocalyptic number.

20625660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20625660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34420932).

20625660 is an abundant number, since it is smaller than the sum of its proper divisors (48216204).

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

20625660 is a wasteful number, since it uses less digits than its factorization.

20625660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20625660 is about 4541.5481941734. The cubic root of 20625660 is about 274.2432528206.

The spelling of 20625660 in words is "twenty million, six hundred twenty-five thousand, six hundred sixty".