20804245780 has 12 divisors (see below), whose sum is σ = 43688916180. Its totient is φ = 8321698304.

The previous prime is 20804245741. The next prime is 20804245801. The reversal of 20804245780 is 8754240802.

It can be written as a sum of positive squares in 2 ways, for example, as 2543588356 + 18260657424 = 50434^2 + 135132^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520106125 + ... + 520106164.

It is an arithmetic number, because the mean of its divisors is an integer number (3640743015).

Almost surely, 2^20804245780 is an apocalyptic number.

20804245780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20804245780 is an abundant number, since it is smaller than the sum of its proper divisors (22884670400).

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

20804245780 is a wasteful number, since it uses less digits than its factorization.

20804245780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040212298 (or 1040212296 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 40.

The spelling of 20804245780 in words is "twenty billion, eight hundred four million, two hundred forty-five thousand, seven hundred eighty".