18020344860 has 144 divisors (see below), whose sum is σ = 65216581920. Its totient is φ = 4118929920.

The previous prime is 18020344801. The next prime is 18020344873. The reversal of 18020344860 is 6844302081.

18020344860 is a `hidden beast` number, since 1 + 8 + 0 + 203 + 448 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314061 + ... + 366980.

It is an arithmetic number, because the mean of its divisors is an integer number (452892930).

Almost surely, 2^18020344860 is an apocalyptic number.

18020344860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18020344860 is an abundant number, since it is smaller than the sum of its proper divisors (47196237060).

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

18020344860 is a wasteful number, since it uses less digits than its factorization.

18020344860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681073 (or 681058 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 18020344860 in words is "eighteen billion, twenty million, three hundred forty-four thousand, eight hundred sixty".