18851288220 has 48 divisors (see below), whose sum is σ = 58648453920. Its totient is φ = 5027010048.

The previous prime is 18851288189. The next prime is 18851288227. The reversal of 18851288220 is 2288215881.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18851288227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 17454357 + ... + 17455436.

It is an arithmetic number, because the mean of its divisors is an integer number (1221842790).

Almost surely, 2^18851288220 is an apocalyptic number.

18851288220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18851288220 is an abundant number, since it is smaller than the sum of its proper divisors (39797165700).

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

18851288220 is a wasteful number, since it uses less digits than its factorization.

18851288220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34909811 (or 34909803 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 45.

The spelling of 18851288220 in words is "eighteen billion, eight hundred fifty-one million, two hundred eighty-eight thousand, two hundred twenty".