20997025 has 12 divisors (see below), whose sum is σ = 29756032. Its totient is φ = 14397840.

The previous prime is 20997017. The next prime is 20997047. The reversal of 20997025 is 52079902.

It is not a de Polignac number, because 20997025 - 2³ = 20997017 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, 59817 + ... + 60166.

Almost surely, 2^20997025 is an apocalyptic number.

20997025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20997025 is a deficient number, since it is larger than the sum of its proper divisors (8759007).

20997025 is a wasteful number, since it uses less digits than its factorization.

20997025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120000 (or 119995 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 20997025 is about 4582.2510843471. The cubic root of 20997025 is about 275.8793887698.

The spelling of 20997025 in words is "twenty million, nine hundred ninety-seven thousand, twenty-five".