20890925 has 12 divisors (see below), whose sum is σ = 28260096. Its totient is φ = 15193200.

The previous prime is 20890913. The next prime is 20890927. The reversal of 20890925 is 52909802.

It is not a de Polignac number, because 20890925 - 2⁸ = 20890669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20890927) 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, 37709 + ... + 38258.

It is an arithmetic number, because the mean of its divisors is an integer number (2355008).

Almost surely, 2^20890925 is an apocalyptic number.

20890925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20890925 is a deficient number, since it is larger than the sum of its proper divisors (7369171).

20890925 is a wasteful number, since it uses less digits than its factorization.

20890925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75988 (or 75983 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 20890925 is about 4570.6591428371. The cubic root of 20890925 is about 275.4139221183.

The spelling of 20890925 in words is "twenty million, eight hundred ninety thousand, nine hundred twenty-five".