18881895020 has 24 divisors (see below), whose sum is σ = 39750879168. Its totient is φ = 7533920000.

The previous prime is 18881894981. The next prime is 18881895023. The reversal of 18881895020 is 2059818881.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18881895020.

It is not an unprimeable number, because it can be changed into a prime (18881895023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1169156 + ... + 1185195.

It is an arithmetic number, because the mean of its divisors is an integer number (1656286632).

Almost surely, 2^18881895020 is an apocalyptic number.

18881895020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18881895020 is an abundant number, since it is smaller than the sum of its proper divisors (20868984148).

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

18881895020 is a wasteful number, since it uses less digits than its factorization.

18881895020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354761 (or 2354759 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 50.

The spelling of 18881895020 in words is "eighteen billion, eight hundred eighty-one million, eight hundred ninety-five thousand, twenty".