20995825 has 12 divisors (see below), whose sum is σ = 26641648. Its totient is φ = 16405200.

The previous prime is 20995787. The next prime is 20995831. The reversal of 20995825 is 52859902.

It is a de Polignac number, because none of the positive numbers 2^k-20995825 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8691 + ... + 10840.

Almost surely, 2^20995825 is an apocalyptic number.

20995825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20995825 is a deficient number, since it is larger than the sum of its proper divisors (5645823).

20995825 is a wasteful number, since it uses less digits than its factorization.

20995825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19584 (or 19579 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 20995825 is about 4582.1201424668. The cubic root of 20995825 is about 275.8741330796.

The spelling of 20995825 in words is "twenty million, nine hundred ninety-five thousand, eight hundred twenty-five".