131720720 has 20 divisors (see below), whose sum is σ = 306250860. Its totient is φ = 52688256.

The previous prime is 131720713. The next prime is 131720731. The reversal of 131720720 is 27027131.

131720720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 95335696 + 36385024 = 9764^2 + 6032^2 .

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

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, 823175 + ... + 823334.

It is an arithmetic number, because the mean of its divisors is an integer number (15312543).

Almost surely, 2^131720720 is an apocalyptic number.

131720720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131720720 is an abundant number, since it is smaller than the sum of its proper divisors (174530140).

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

131720720 is a wasteful number, since it uses less digits than its factorization.

131720720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646522 (or 1646516 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 131720720 is about 11476.9647555440. The cubic root of 131720720 is about 508.8049939847.

Adding to 131720720 its reverse (27027131), we get a palindrome (158747851).

The spelling of 131720720 in words is "one hundred thirty-one million, seven hundred twenty thousand, seven hundred twenty".