20808252 has 30 divisors (see below), whose sum is σ = 54397728. Its totient is φ = 6935976.

The previous prime is 20808251. The next prime is 20808301. The reversal of 20808252 is 25280802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808251) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31788 + ... + 32435.

Almost surely, 2^20808252 is an apocalyptic number.

It is an amenable number.

20808252 is an abundant number, since it is smaller than the sum of its proper divisors (33589476).

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

20808252 is a wasteful number, since it uses less digits than its factorization.

20808252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64239 (or 64228 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 20808252 is about 4561.6062960321. The cubic root of 20808252 is about 275.0501374150.

The spelling of 20808252 in words is "twenty million, eight hundred eight thousand, two hundred fifty-two".