20625625 has 20 divisors (see below), whose sum is σ = 26244724. Its totient is φ = 16200000.

The previous prime is 20625617. The next prime is 20625629. The reversal of 20625625 is 52652602.

It can be written as a sum of positive squares in 10 ways, for example, as 20178064 + 447561 = 4492^2 + 669^2 .

It is not a de Polignac number, because 20625625 - 2³ = 20625617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20625593 and 20625602.

It is not an unprimeable number, because it can be changed into a prime (20625629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37855 + ... + 38395.

Almost surely, 2^20625625 is an apocalyptic number.

20625625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20625625 is a deficient number, since it is larger than the sum of its proper divisors (5619099).

20625625 is an frugal number, since it uses more digits than its factorization.

20625625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20625625 is about 4541.5443408603. The cubic root of 20625625 is about 274.2430976980.

The spelling of 20625625 in words is "twenty million, six hundred twenty-five thousand, six hundred twenty-five".