20451794556 has 24 divisors (see below), whose sum is σ = 47724888064. Its totient is φ = 6816688560.

The previous prime is 20451794543. The next prime is 20451794591. The reversal of 20451794556 is 65549715402.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 90501 + ... + 221571.

Almost surely, 2^20451794556 is an apocalyptic number.

It is an amenable number.

20451794556 is an abundant number, since it is smaller than the sum of its proper divisors (27273093508).

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

20451794556 is a wasteful number, since it uses less digits than its factorization.

20451794556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144081 (or 144079 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 20451794556 in words is "twenty billion, four hundred fifty-one million, seven hundred ninety-four thousand, five hundred fifty-six".