20591474904 has 192 divisors, whose sum is σ = 74878352640. Its totient is φ = 4936999680.

The previous prime is 20591474867. The next prime is 20591474909. The reversal of 20591474904 is 40947419502.

20591474904 is a `hidden beast` number, since 2 + 0 + 5 + 91 + 474 + 90 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20591474904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20591474909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70782 + ... + 214925.

It is an arithmetic number, because the mean of its divisors is an integer number (389991420).

Almost surely, 2^20591474904 is an apocalyptic number.

20591474904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20591474904 is an abundant number, since it is smaller than the sum of its proper divisors (54286877736).

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

20591474904 is a wasteful number, since it uses less digits than its factorization.

20591474904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285750 (or 285743 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 20591474904 in words is "twenty billion, five hundred ninety-one million, four hundred seventy-four thousand, nine hundred four".