20508625 has 16 divisors (see below), whose sum is σ = 25758720. Its totient is φ = 16302000.

The previous prime is 20508611. The next prime is 20508643. The reversal of 20508625 is 52680502.

It is not a de Polignac number, because 20508625 - 2⁹ = 20508113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20508593 and 20508602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23446 + ... + 24304.

It is an arithmetic number, because the mean of its divisors is an integer number (1609920).

Almost surely, 2^20508625 is an apocalyptic number.

20508625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20508625 is a deficient number, since it is larger than the sum of its proper divisors (5250095).

20508625 is an equidigital number, since it uses as much as digits as its factorization.

20508625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1055 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20508625 is about 4528.6449408184. The cubic root of 20508625 is about 273.7235610365.

The spelling of 20508625 in words is "twenty million, five hundred eight thousand, six hundred twenty-five".