19186894220 has 24 divisors (see below), whose sum is σ = 43391899824. Its totient is φ = 7084391616.

The previous prime is 19186894217. The next prime is 19186894261. The reversal of 19186894220 is 2249868191.

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, 36897614 + ... + 36898133.

It is an arithmetic number, because the mean of its divisors is an integer number (1807995826).

Almost surely, 2^19186894220 is an apocalyptic number.

19186894220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19186894220 is an abundant number, since it is smaller than the sum of its proper divisors (24205005604).

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

19186894220 is a wasteful number, since it uses less digits than its factorization.

19186894220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73795769 (or 73795767 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 19186894220 in words is "nineteen billion, one hundred eighty-six million, eight hundred ninety-four thousand, two hundred twenty".