18480220820 has 12 divisors (see below), whose sum is σ = 38808463764. Its totient is φ = 7392088320.

The previous prime is 18480220817. The next prime is 18480220879. The reversal of 18480220820 is 2802208481.

It can be written as a sum of positive squares in 2 ways, for example, as 4136805124 + 14343415696 = 64318^2 + 119764^2 .

It is a super-2 number, since 2×18480220820² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462005501 + ... + 462005540.

It is an arithmetic number, because the mean of its divisors is an integer number (3234038647).

Almost surely, 2^18480220820 is an apocalyptic number.

18480220820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18480220820 is an abundant number, since it is smaller than the sum of its proper divisors (20328242944).

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

18480220820 is a wasteful number, since it uses less digits than its factorization.

18480220820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924011050 (or 924011048 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The spelling of 18480220820 in words is "eighteen billion, four hundred eighty million, two hundred twenty thousand, eight hundred twenty".