231433220420 has 24 divisors (see below), whose sum is σ = 493977138648. Its totient is φ = 91055692800.

The previous prime is 231433220363. The next prime is 231433220429. The reversal of 231433220420 is 24022334132.

It can be written as a sum of positive squares in 4 ways, for example, as 23416956676 + 208016263744 = 153026^2 + 456088^2 .

It is a super-2 number, since 2×231433220420² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231433220420.

It is not an unprimeable number, because it can be changed into a prime (231433220429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94848461 + ... + 94850900.

It is an arithmetic number, because the mean of its divisors is an integer number (20582380777).

Almost surely, 2^231433220420 is an apocalyptic number.

231433220420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231433220420 is an abundant number, since it is smaller than the sum of its proper divisors (262543918228).

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

231433220420 is a wasteful number, since it uses less digits than its factorization.

231433220420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189699431 (or 189699429 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 231433220420 its reverse (24022334132), we get a palindrome (255455554552).

The spelling of 231433220420 in words is "two hundred thirty-one billion, four hundred thirty-three million, two hundred twenty thousand, four hundred twenty".