20715951984484 has 81 divisors (see below), whose sum is σ = 38733966909547. Its totient is φ = 9692536254208.

The previous prime is 20715951984451. The next prime is 20715951984509. The reversal of 20715951984484 is 48448915951702.

The square root of 20715951984484 is 4551478.

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

It can be written as a sum of positive squares in 4 ways, for example, as 7267068062500 + 13448883921984 = 2695750^2 + 3667272^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 40699316022 + ... + 40699316530.

Almost surely, 2^{20715951984484} is an apocalyptic number.

20715951984484 is the 4551478-th square number.

It is an amenable number.

20715951984484 is a deficient number, since it is larger than the sum of its proper divisors (18018014925063).

20715951984484 is an frugal number, since it uses more digits than its factorization.

20715951984484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 67.

The spelling of 20715951984484 in words is "twenty trillion, seven hundred fifteen billion, nine hundred fifty-one million, nine hundred eighty-four thousand, four hundred eighty-four".