20720704 has 21 divisors (see below), whose sum is σ = 41190037. Its totient is φ = 10342144.

The previous prime is 20720681. The next prime is 20720717. The reversal of 20720704 is 40702702.

The square root of 20720704 is 4552.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3415104 + 17305600 = 1848^2 + 4160^2 .

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a pancake number, because a pancake can be divided into 20720704 parts by 6437 straight cuts.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 36132 + ... + 36700.

Almost surely, 2^20720704 is an apocalyptic number.

20720704 is the 4552-nd square number.

It is an amenable number.

20720704 is a deficient number, since it is larger than the sum of its proper divisors (20469333).

20720704 is an frugal number, since it uses more digits than its factorization.

20720704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The cubic root of 20720704 is about 274.6638493233.

Multiplying 20720704 by its product of nonzero digits (784), we get a square (16245031936 = 127456²).

The spelling of 20720704 in words is "twenty million, seven hundred twenty thousand, seven hundred four".