231310742220 has 144 divisors (see below), whose sum is σ = 723519276480. Its totient is φ = 59779584000.

The previous prime is 231310742189. The next prime is 231310742227. The reversal of 231310742220 is 22247013132.

231310742220 is a `hidden beast` number, since 231 + 3 + 1 + 0 + 7 + 422 + 2 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (231310742227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1010596 + ... + 1218164.

It is an arithmetic number, because the mean of its divisors is an integer number (5024439420).

Almost surely, 2^231310742220 is an apocalyptic number.

231310742220 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 231310742220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (361759638240).

231310742220 is an abundant number, since it is smaller than the sum of its proper divisors (492208534260).

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

231310742220 is a wasteful number, since it uses less digits than its factorization.

231310742220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207776 (or 207771 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

Adding to 231310742220 its reverse (22247013132), we get a palindrome (253557755352).

The spelling of 231310742220 in words is "two hundred thirty-one billion, three hundred ten million, seven hundred forty-two thousand, two hundred twenty".