20408625 has 32 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 10882800.

The previous prime is 20408599. The next prime is 20408629. The reversal of 20408625 is 52680402.

It is not a de Polignac number, because 20408625 - 2⁶ = 20408561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20408629) 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 31 ways as a sum of consecutive naturals, for example, 352 + ... + 6398.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^20408625 is an apocalyptic number.

20408625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20408625 is a deficient number, since it is larger than the sum of its proper divisors (17330895).

20408625 is an equidigital number, since it uses as much as digits as its factorization.

20408625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6071 (or 6055 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20408625 is about 4517.5906189030. The cubic root of 20408625 is about 273.2779441933.

The spelling of 20408625 in words is "twenty million, four hundred eight thousand, six hundred twenty-five".