20712704 has 18 divisors (see below), whose sum is σ = 41345010. Its totient is φ = 10356224.

The previous prime is 20712697. The next prime is 20712707. The reversal of 20712704 is 40721702.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 4326400 = 4048^2 + 2080^2 .

It is a super-2 number, since 2×20712704² = 858032213983232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20712704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40199 + ... + 40710.

It is an arithmetic number, because the mean of its divisors is an integer number (2296945).

Almost surely, 2^20712704 is an apocalyptic number.

It is an amenable number.

20712704 is a deficient number, since it is larger than the sum of its proper divisors (20632306).

20712704 is an frugal number, since it uses more digits than its factorization.

20712704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80925 (or 80911 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20712704 is about 4551.1211805444. The cubic root of 20712704 is about 274.6284967015.

The spelling of 20712704 in words is "twenty million, seven hundred twelve thousand, seven hundred four".