20947930756 has 9 divisors (see below), whose sum is σ = 36659385399. Its totient is φ = 10473820644.

The previous prime is 20947930739. The next prime is 20947930763. The reversal of 20947930756 is 65703974902.

The square root of 20947930756 is 144734.

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

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, 253285 + ... + 325651.

Almost surely, 2^20947930756 is an apocalyptic number.

20947930756 is the 144734-th square number.

It is an amenable number.

20947930756 is a deficient number, since it is larger than the sum of its proper divisors (15711454643).

20947930756 is an frugal number, since it uses more digits than its factorization.

20947930756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144738 (or 72369 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 20947930756 in words is "twenty billion, nine hundred forty-seven million, nine hundred thirty thousand, seven hundred fifty-six".