20802130409784 has 96 divisors (see below), whose sum is σ = 55132640478720. Its totient is φ = 6539635386432.

The previous prime is 20802130409783. The next prime is 20802130409839. The reversal of 20802130409784 is 48790403120802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802130409783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3451302 + ... + 7315445.

It is an arithmetic number, because the mean of its divisors is an integer number (574298338320).

Almost surely, 2^{20802130409784} is an apocalyptic number.

20802130409784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20802130409784 is an abundant number, since it is smaller than the sum of its proper divisors (34330510068936).

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

20802130409784 is a wasteful number, since it uses less digits than its factorization.

20802130409784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10767017 (or 10766994 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 20802130409784 in words is "twenty trillion, eight hundred two billion, one hundred thirty million, four hundred nine thousand, seven hundred eighty-four".