20618625 has 16 divisors (see below), whose sum is σ = 34310016. Its totient is φ = 10996400.

The previous prime is 20618621. The next prime is 20618639. The reversal of 20618625 is 52681602.

It is not a de Polignac number, because 20618625 - 2² = 20618621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20618592 and 20618601.

It is not an unprimeable number, because it can be changed into a prime (20618621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27117 + ... + 27866.

It is an arithmetic number, because the mean of its divisors is an integer number (2144376).

Almost surely, 2^20618625 is an apocalyptic number.

20618625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20618625 is a deficient number, since it is larger than the sum of its proper divisors (13691391).

20618625 is an equidigital number, since it uses as much as digits as its factorization.

20618625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55001 (or 54991 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20618625 is about 4540.7736125026. The cubic root of 20618625 is about 274.2120696459.

The spelling of 20618625 in words is "twenty million, six hundred eighteen thousand, six hundred twenty-five".