20878399226920 has 16 divisors (see below), whose sum is σ = 46976398260660. Its totient is φ = 8351359690752.

The previous prime is 20878399226897. The next prime is 20878399227031. The reversal of 20878399226920 is 2962299387802.

It can be written as a sum of positive squares in 2 ways, for example, as 20877899346756 + 499880164 = 4569234^2 + 22358^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260979990297 + ... + 260979990376.

Almost surely, 2^{20878399226920} is an apocalyptic number.

20878399226920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20878399226920 is an abundant number, since it is smaller than the sum of its proper divisors (26097999033740).

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

20878399226920 is a wasteful number, since it uses less digits than its factorization.

20878399226920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521959980684 (or 521959980680 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 67.

The spelling of 20878399226920 in words is "twenty trillion, eight hundred seventy-eight billion, three hundred ninety-nine million, two hundred twenty-six thousand, nine hundred twenty".