231085568220 has 96 divisors (see below), whose sum is σ = 698050870272. Its totient is φ = 56781458688.

The previous prime is 231085568179. The next prime is 231085568221. The reversal of 231085568220 is 22865580132.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231085568221) 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, 176029 + ... + 702251.

It is an arithmetic number, because the mean of its divisors is an integer number (7271363232).

Almost surely, 2^231085568220 is an apocalyptic number.

231085568220 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 231085568220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349025435136).

231085568220 is an abundant number, since it is smaller than the sum of its proper divisors (466965302052).

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

231085568220 is a wasteful number, since it uses less digits than its factorization.

231085568220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526811 (or 526809 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 231085568220 in words is "two hundred thirty-one billion, eighty-five million, five hundred sixty-eight thousand, two hundred twenty".