20621625 has 32 divisors (see below), whose sum is σ = 34664448. Its totient is φ = 10886400.

The previous prime is 20621609. The next prime is 20621677. The reversal of 20621625 is 52612602.

It is not a de Polignac number, because 20621625 - 2⁴ = 20621609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20621595 and 20621604.

It is an unprimeable number.

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, 47409 + ... + 47841.

It is an arithmetic number, because the mean of its divisors is an integer number (1083264).

Almost surely, 2^20621625 is an apocalyptic number.

20621625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20621625 is a deficient number, since it is larger than the sum of its proper divisors (14042823).

20621625 is a wasteful number, since it uses less digits than its factorization.

20621625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20621625 is about 4541.1039406735. The cubic root of 20621625 is about 274.2253682423.

The spelling of 20621625 in words is "twenty million, six hundred twenty-one thousand, six hundred twenty-five".