20713920 has 56 divisors (see below), whose sum is σ = 65769744. Its totient is φ = 5523456.

The previous prime is 20713907. The next prime is 20713963. The reversal of 20713920 is 2931702.

It is a super-3 number, since 3×20713920³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9829 + ... + 11748.

Almost surely, 2^20713920 is an apocalyptic number.

20713920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20713920 is an abundant number, since it is smaller than the sum of its proper divisors (45055824).

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

20713920 is a wasteful number, since it uses less digits than its factorization.

20713920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21597 (or 21587 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20713920 is about 4551.2547720381. The cubic root of 20713920 is about 274.6338708866.

The spelling of 20713920 in words is "twenty million, seven hundred thirteen thousand, nine hundred twenty".