20908625 has 8 divisors (see below), whose sum is σ = 26094120. Its totient is φ = 16726800.

The previous prime is 20908609. The next prime is 20908627. The reversal of 20908625 is 52680902.

It can be written as a sum of positive squares in 4 ways, for example, as 559504 + 20349121 = 748^2 + 4511^2 .

It is not a de Polignac number, because 20908625 - 2⁴ = 20908609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20908591 and 20908600.

It is not an unprimeable number, because it can be changed into a prime (20908627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83510 + ... + 83759.

It is an arithmetic number, because the mean of its divisors is an integer number (3261765).

Almost surely, 2^20908625 is an apocalyptic number.

20908625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20908625 is a deficient number, since it is larger than the sum of its proper divisors (5185495).

20908625 is an equidigital number, since it uses as much as digits as its factorization.

20908625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167284 (or 167274 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20908625 is about 4572.5949962795. The cubic root of 20908625 is about 275.4916823630.

The spelling of 20908625 in words is "twenty million, nine hundred eight thousand, six hundred twenty-five".