18262021840 has 20 divisors (see below), whose sum is σ = 42459200964. Its totient is φ = 7304808704.

The previous prime is 18262021837. The next prime is 18262021901. The reversal of 18262021840 is 4812026281.

It can be written as a sum of positive squares in 2 ways, for example, as 14382725184 + 3879296656 = 119928^2 + 62284^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 18262021796 and 18262021805.

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, 114137557 + ... + 114137716.

Almost surely, 2^18262021840 is an apocalyptic number.

18262021840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18262021840 is an abundant number, since it is smaller than the sum of its proper divisors (24197179124).

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

18262021840 is a wasteful number, since it uses less digits than its factorization.

18262021840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228275286 (or 228275280 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The spelling of 18262021840 in words is "eighteen billion, two hundred sixty-two million, twenty-one thousand, eight hundred forty".