20919572496 has 135 divisors (see below), whose sum is σ = 62280037911. Its totient is φ = 6553746432.

The previous prime is 20919572441. The next prime is 20919572507. The reversal of 20919572496 is 69427591902.

The square root of 20919572496 is 144636.

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

20919572496 is a `hidden beast` number, since 20 + 9 + 1 + 9 + 572 + 49 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 280227600 + 20639344896 = 16740^2 + 143664^2 .

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 26 ways as a sum of consecutive naturals, for example, 29505390 + ... + 29506098.

Almost surely, 2^20919572496 is an apocalyptic number.

20919572496 is the 144636-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20919572496

20919572496 is an abundant number, since it is smaller than the sum of its proper divisors (41360465415).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20919572496 is an equidigital number, since it uses as much as digits as its factorization.

20919572496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 20919572496 in words is "twenty billion, nine hundred nineteen million, five hundred seventy-two thousand, four hundred ninety-six".