20669625 has 48 divisors (see below), whose sum is σ = 39262080. Its totient is φ = 10432800.

The previous prime is 20669611. The next prime is 20669641. The reversal of 20669625 is 52696602.

20669625 is a `hidden beast` number, since 20 + 6 + 6 + 9 + 625 = 666.

It is not a de Polignac number, because 20669625 - 2⁷ = 20669497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20669625.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20892 + ... + 21858.

It is an arithmetic number, because the mean of its divisors is an integer number (817960).

Almost surely, 2^20669625 is an apocalyptic number.

20669625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20669625 is a deficient number, since it is larger than the sum of its proper divisors (18592455).

20669625 is a wasteful number, since it uses less digits than its factorization.

20669625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20669625 is about 4546.3859273053. The cubic root of 20669625 is about 274.4379705960.

The spelling of 20669625 in words is "twenty million, six hundred sixty-nine thousand, six hundred twenty-five".