18431271445720 has 64 divisors (see below), whose sum is σ = 47402532313920. Its totient is φ = 6318248492544.

The previous prime is 18431271445687. The next prime is 18431271445729. The reversal of 18431271445720 is 2754417213481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18431271445729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3742627 + ... + 7132306.

It is an arithmetic number, because the mean of its divisors is an integer number (740664567405).

Almost surely, 2^{18431271445720} is an apocalyptic number.

18431271445720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18431271445720 is an abundant number, since it is smaller than the sum of its proper divisors (28971260868200).

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

18431271445720 is a wasteful number, since it uses less digits than its factorization.

18431271445720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10881004 (or 10881000 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 18431271445720 in words is "eighteen trillion, four hundred thirty-one billion, two hundred seventy-one million, four hundred forty-five thousand, seven hundred twenty".