20708400 has 60 divisors (see below), whose sum is σ = 66339752. Its totient is φ = 5521920.

The previous prime is 20708399. The next prime is 20708447. The reversal of 20708400 is 480702.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

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, 7429 + ... + 9828.

Almost surely, 2^20708400 is an apocalyptic number.

20708400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20708400 is an abundant number, since it is smaller than the sum of its proper divisors (45631352).

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

20708400 is a wasteful number, since it uses less digits than its factorization.

20708400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17278 (or 17267 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20708400 is about 4550.6483054615. The cubic root of 20708400 is about 274.6094732247.

The spelling of 20708400 in words is "twenty million, seven hundred eight thousand, four hundred".