20868500 has 24 divisors (see below), whose sum is σ = 45577896. Its totient is φ = 8347200.

The previous prime is 20868499. The next prime is 20868509. The reversal of 20868500 is 586802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 329476 + 20539024 = 574^2 + 4532^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20369 + ... + 21368.

It is an arithmetic number, because the mean of its divisors is an integer number (1899079).

Almost surely, 2^20868500 is an apocalyptic number.

20868500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20868500 is an abundant number, since it is smaller than the sum of its proper divisors (24709396).

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

20868500 is a wasteful number, since it uses less digits than its factorization.

20868500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41756 (or 41744 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20868500 is about 4568.2053368911. The cubic root of 20868500 is about 275.3153407419.

The spelling of 20868500 in words is "twenty million, eight hundred sixty-eight thousand, five hundred".