20716420624 has 15 divisors (see below), whose sum is σ = 40139180463. Its totient is φ = 10357922448.

The previous prime is 20716420601. The next prime is 20716420639. The reversal of 20716420624 is 42602461702.

The square root of 20716420624 is 143932.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20716420624.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 557737 + ... + 593719.

Almost surely, 2^20716420624 is an apocalyptic number.

20716420624 is the 143932-nd square number.

It is an amenable number.

20716420624 is a deficient number, since it is larger than the sum of its proper divisors (19422759839).

20716420624 is an frugal number, since it uses more digits than its factorization.

20716420624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71974 (or 35985 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 20716420624 in words is "twenty billion, seven hundred sixteen million, four hundred twenty thousand, six hundred twenty-four".