20661751496 has 16 divisors (see below), whose sum is σ = 38749417200. Its totient is φ = 10328573584.

The previous prime is 20661751493. The next prime is 20661751531. The reversal of 20661751496 is 69415716602.

It is a self number, because there is not a number n which added to its sum of digits gives 20661751496.

It is not an unprimeable number, because it can be changed into a prime (20661751493) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 249326 + ... + 321693.

It is an arithmetic number, because the mean of its divisors is an integer number (2421838575).

Almost surely, 2^20661751496 is an apocalyptic number.

It is an amenable number.

20661751496 is a deficient number, since it is larger than the sum of its proper divisors (18087665704).

20661751496 is a wasteful number, since it uses less digits than its factorization.

20661751496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575548 (or 575544 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 20661751496 in words is "twenty billion, six hundred sixty-one million, seven hundred fifty-one thousand, four hundred ninety-six".