131402020 has 24 divisors (see below), whose sum is σ = 278793144. Its totient is φ = 52018176.

The previous prime is 131402017. The next prime is 131402021. The reversal of 131402020 is 20204131.

It can be written as a sum of positive squares in 4 ways, for example, as 17040384 + 114361636 = 4128^2 + 10694^2 .

It is not an unprimeable number, because it can be changed into a prime (131402021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31927 + ... + 35806.

It is an arithmetic number, because the mean of its divisors is an integer number (11616381).

Almost surely, 2^131402020 is an apocalyptic number.

131402020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131402020 is an abundant number, since it is smaller than the sum of its proper divisors (147391124).

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

131402020 is a wasteful number, since it uses less digits than its factorization.

131402020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67839 (or 67837 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 131402020 is about 11463.0720140807. The cubic root of 131402020 is about 508.3943091476.

Adding to 131402020 its reverse (20204131), we get a palindrome (151606151).

The spelling of 131402020 in words is "one hundred thirty-one million, four hundred two thousand, twenty".