164831220 has 48 divisors (see below), whose sum is σ = 512809920. Its totient is φ = 43954848.

The previous prime is 164831207. The next prime is 164831231. The reversal of 164831220 is 22138461.

164831220 is a `hidden beast` number, since 1 + 648 + 3 + 12 + 2 + 0 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152082 + ... + 153161.

It is an arithmetic number, because the mean of its divisors is an integer number (10683540).

Almost surely, 2^164831220 is an apocalyptic number.

164831220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164831220 is an abundant number, since it is smaller than the sum of its proper divisors (347978700).

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

164831220 is a wasteful number, since it uses less digits than its factorization.

164831220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305261 (or 305253 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 164831220 is about 12838.6611451506. The cubic root of 164831220 is about 548.2935761576.

Adding to 164831220 its reverse (22138461), we get a palindrome (186969681).

The spelling of 164831220 in words is "one hundred sixty-four million, eight hundred thirty-one thousand, two hundred twenty".