131223020 has 12 divisors (see below), whose sum is σ = 275568384. Its totient is φ = 52489200.

The previous prime is 131223019. The next prime is 131223047. The reversal of 131223020 is 20322131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131222986 and 131223004.

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, 3280556 + ... + 3280595.

It is an arithmetic number, because the mean of its divisors is an integer number (22964032).

Almost surely, 2^131223020 is an apocalyptic number.

131223020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131223020 is an abundant number, since it is smaller than the sum of its proper divisors (144345364).

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

131223020 is a wasteful number, since it uses less digits than its factorization.

131223020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561160 (or 6561158 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 131223020 is about 11455.2616731352. The cubic root of 131223020 is about 508.1633539593.

Adding to 131223020 its reverse (20322131), we get a palindrome (151545151).

The spelling of 131223020 in words is "one hundred thirty-one million, two hundred twenty-three thousand, twenty".