20713780 has 24 divisors (see below), whose sum is σ = 43817760. Its totient is φ = 8224800.

The previous prime is 20713741. The next prime is 20713799. The reversal of 20713780 is 8731702.

It is a happy number.

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, 946 + ... + 6505.

It is an arithmetic number, because the mean of its divisors is an integer number (1825740).

Almost surely, 2^20713780 is an apocalyptic number.

20713780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20713780 is an abundant number, since it is smaller than the sum of its proper divisors (23103980).

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

20713780 is a wasteful number, since it uses less digits than its factorization.

20713780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7599 (or 7597 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20713780 is about 4551.2393916383. The cubic root of 20713780 is about 274.6332521589.

The spelling of 20713780 in words is "twenty million, seven hundred thirteen thousand, seven hundred eighty".