131220020 has 12 divisors (see below), whose sum is σ = 275562084. Its totient is φ = 52488000.

The previous prime is 131220017. The next prime is 131220029. The reversal of 131220020 is 20022131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25623844 + 105596176 = 5062^2 + 10276^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131219983 and 131220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3280481 + ... + 3280520.

It is an arithmetic number, because the mean of its divisors is an integer number (22963507).

Almost surely, 2^131220020 is an apocalyptic number.

131220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131220020 is an abundant number, since it is smaller than the sum of its proper divisors (144342064).

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

131220020 is a wasteful number, since it uses less digits than its factorization.

131220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561010 (or 6561008 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 131220020 is about 11455.1307281934. The cubic root of 131220020 is about 508.1594814129.

Adding to 131220020 its reverse (20022131), we get a palindrome (151242151).

The spelling of 131220020 in words is "one hundred thirty-one million, two hundred twenty thousand, twenty".