231220020 has 48 divisors (see below), whose sum is σ = 656546688. Its totient is φ = 60789120.

The previous prime is 231220019. The next prime is 231220021. The reversal of 231220020 is 20022132.

It is an interprime number because it is at equal distance from previous prime (231220019) and next prime (231220021).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 231219978 and 231220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220021) 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, 22879 + ... + 31398.

It is an arithmetic number, because the mean of its divisors is an integer number (13678056).

Almost surely, 2^231220020 is an apocalyptic number.

231220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231220020 is an abundant number, since it is smaller than the sum of its proper divisors (425326668).

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

231220020 is a wasteful number, since it uses less digits than its factorization.

231220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54360 (or 54358 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 231220020 is about 15205.9205574671. The cubic root of 231220020 is about 613.7739869200.

Adding to 231220020 its reverse (20022132), we get a palindrome (251242152).

The spelling of 231220020 in words is "two hundred thirty-one million, two hundred twenty thousand, twenty".