231413220 has 96 divisors (see below), whose sum is σ = 727251840. Its totient is φ = 61084800.

The previous prime is 231413201. The next prime is 231413227. The reversal of 231413220 is 22314132.

231413220 = T₃₁₆ + T₃₁₇ + ... + T₁₁₂₃.

231413220 is a `hidden beast` number, since 2 + 31 + 413 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231413193 and 231413202.

It is not an unprimeable number, because it can be changed into a prime (231413227) 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, 52419 + ... + 56661.

It is an arithmetic number, because the mean of its divisors is an integer number (7575540).

Almost surely, 2^231413220 is an apocalyptic number.

231413220 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 231413220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363625920).

231413220 is an abundant number, since it is smaller than the sum of its proper divisors (495838620).

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

231413220 is a wasteful number, since it uses less digits than its factorization.

231413220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362 (or 4354 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231413220 is about 15212.2720196557. The cubic root of 231413220 is about 613.9448892523.

Adding to 231413220 its reverse (22314132), we get a palindrome (253727352).

The spelling of 231413220 in words is "two hundred thirty-one million, four hundred thirteen thousand, two hundred twenty".