231100020 has 96 divisors (see below), whose sum is σ = 722010240. Its totient is φ = 61367040.

The previous prime is 231100013. The next prime is 231100027. The reversal of 231100020 is 20001132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231100013) and next prime (231100027).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 231099975 and 231100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231100027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150979 + ... + 152501.

It is an arithmetic number, because the mean of its divisors is an integer number (7520940).

Almost surely, 2^231100020 is an apocalyptic number.

231100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (361005120).

231100020 is an abundant number, since it is smaller than the sum of its proper divisors (490910220).

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

231100020 is a wasteful number, since it uses less digits than its factorization.

231100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 231100020 is about 15201.9742138974. The cubic root of 231100020 is about 613.6677884692.

Adding to 231100020 its reverse (20001132), we get a palindrome (251101152).

The spelling of 231100020 in words is "two hundred thirty-one million, one hundred thousand, twenty".