20511804739404 has 24 divisors (see below), whose sum is σ = 52211866609728. Its totient is φ = 6215698405840.

The previous prime is 20511804739339. The next prime is 20511804739451. The reversal of 20511804739404 is 40493740811502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77696229942 + ... + 77696230205.

It is an arithmetic number, because the mean of its divisors is an integer number (2175494442072).

Almost surely, 2^{20511804739404} is an apocalyptic number.

It is an amenable number.

20511804739404 is an abundant number, since it is smaller than the sum of its proper divisors (31700061870324).

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

20511804739404 is a wasteful number, since it uses less digits than its factorization.

20511804739404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155392460165 (or 155392460163 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 20511804739404 in words is "twenty trillion, five hundred eleven billion, eight hundred four million, seven hundred thirty-nine thousand, four hundred four".