20724764 has 6 divisors (see below), whose sum is σ = 36268344. Its totient is φ = 10362380.

The previous prime is 20724731. The next prime is 20724793. The reversal of 20724764 is 46742702.

It is a self number, because there is not a number n which added to its sum of digits gives 20724764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590592 + ... + 2590599.

It is an arithmetic number, because the mean of its divisors is an integer number (6044724).

Almost surely, 2^20724764 is an apocalyptic number.

It is an amenable number.

20724764 is a deficient number, since it is larger than the sum of its proper divisors (15543580).

20724764 is a wasteful number, since it uses less digits than its factorization.

20724764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5181195 (or 5181193 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 20724764 is about 4552.4459359777. The cubic root of 20724764 is about 274.6817872982.

The spelling of 20724764 in words is "twenty million, seven hundred twenty-four thousand, seven hundred sixty-four".