18812127220 has 24 divisors (see below), whose sum is σ = 39512688264. Its totient is φ = 7523475456.

The previous prime is 18812127199. The next prime is 18812127311. The reversal of 18812127220 is 2272121881.

It can be written as a sum of positive squares in 4 ways, for example, as 68326756 + 18743800464 = 8266^2 + 136908^2 .

It is a super-2 number, since 2×18812127220² (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 7 ways as a sum of consecutive naturals, for example, 30004 + ... + 196276.

It is an arithmetic number, because the mean of its divisors is an integer number (1646362011).

Almost surely, 2^18812127220 is an apocalyptic number.

18812127220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18812127220 is an abundant number, since it is smaller than the sum of its proper divisors (20700561044).

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

18812127220 is a wasteful number, since it uses less digits than its factorization.

18812127220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171939 (or 171937 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The spelling of 18812127220 in words is "eighteen billion, eight hundred twelve million, one hundred twenty-seven thousand, two hundred twenty".