20993925 has 12 divisors (see below), whose sum is σ = 34710080. Its totient is φ = 11196720.

The previous prime is 20993923. The next prime is 20993939. The reversal of 20993925 is 52939902.

It is not a de Polignac number, because 20993925 - 2¹ = 20993923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139885 + ... + 140034.

Almost surely, 2^20993925 is an apocalyptic number.

20993925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20993925 is a deficient number, since it is larger than the sum of its proper divisors (13716155).

20993925 is a wasteful number, since it uses less digits than its factorization.

20993925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279932 (or 279927 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 20993925 is about 4581.9128101700. The cubic root of 20993925 is about 275.8658111606.

The spelling of 20993925 in words is "twenty million, nine hundred ninety-three thousand, nine hundred twenty-five".