20551494764 has 12 divisors (see below), whose sum is σ = 37125281088. Its totient is φ = 9944271600.

The previous prime is 20551494751. The next prime is 20551494767. The reversal of 20551494764 is 46749415502.

It is not an unprimeable number, because it can be changed into a prime (20551494767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82868807 + ... + 82869054.

It is an arithmetic number, because the mean of its divisors is an integer number (3093773424).

Almost surely, 2^20551494764 is an apocalyptic number.

It is an amenable number.

20551494764 is a deficient number, since it is larger than the sum of its proper divisors (16573786324).

20551494764 is a wasteful number, since it uses less digits than its factorization.

20551494764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165737896 (or 165737894 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 20551494764 in words is "twenty billion, five hundred fifty-one million, four hundred ninety-four thousand, seven hundred sixty-four".