20021925 has 48 divisors (see below), whose sum is σ = 41283072. Its totient is φ = 8318400.

The previous prime is 20021917. The next prime is 20021951. The reversal of 20021925 is 52912002.

It is not a de Polignac number, because 20021925 - 2³ = 20021917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 4042 + ... + 7508.

It is an arithmetic number, because the mean of its divisors is an integer number (860064).

Almost surely, 2^20021925 is an apocalyptic number.

20021925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20021925 is an abundant number, since it is smaller than the sum of its proper divisors (21261147).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021925 is a wasteful number, since it uses less digits than its factorization.

20021925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498 (or 3493 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20021925 is about 4474.5865730814. The cubic root of 20021925 is about 271.5409147798.

Adding to 20021925 its reverse (52912002), we get a palindrome (72933927).

The spelling of 20021925 in words is "twenty million, twenty-one thousand, nine hundred twenty-five".