231646220 has 48 divisors (see below), whose sum is σ = 524989920. Its totient is φ = 85349376.

The previous prime is 231646211. The next prime is 231646223. The reversal of 231646220 is 22646132.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 231646220.

It is not an unprimeable number, because it can be changed into a prime (231646223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229076 + ... + 230084.

It is an arithmetic number, because the mean of its divisors is an integer number (10937290).

Almost surely, 2^231646220 is an apocalyptic number.

231646220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231646220 is an abundant number, since it is smaller than the sum of its proper divisors (293343700).

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

231646220 is a wasteful number, since it uses less digits than its factorization.

231646220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914 (or 1912 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 231646220 is about 15219.9283835372. The cubic root of 231646220 is about 614.1508716878.

The spelling of 231646220 in words is "two hundred thirty-one million, six hundred forty-six thousand, two hundred twenty".