19802178220 has 24 divisors (see below), whose sum is σ = 45364990608. Its totient is φ = 7200792000.

The previous prime is 19802178211. The next prime is 19802178283. The reversal of 19802178220 is 2287120891.

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, 45004731 + ... + 45005170.

It is an arithmetic number, because the mean of its divisors is an integer number (1890207942).

Almost surely, 2^19802178220 is an apocalyptic number.

19802178220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19802178220 is an abundant number, since it is smaller than the sum of its proper divisors (25562812388).

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

19802178220 is a wasteful number, since it uses less digits than its factorization.

19802178220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90009921 (or 90009919 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The spelling of 19802178220 in words is "nineteen billion, eight hundred two million, one hundred seventy-eight thousand, two hundred twenty".