163231220 has 24 divisors (see below), whose sum is σ = 343237608. Its totient is φ = 65206400.

The previous prime is 163231219. The next prime is 163231231. The reversal of 163231220 is 22132361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5326864 + 157904356 = 2308^2 + 12566^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 163231192 and 163231201.

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 7 ways as a sum of consecutive naturals, for example, 11450 + ... + 21390.

It is an arithmetic number, because the mean of its divisors is an integer number (14301567).

Almost surely, 2^163231220 is an apocalyptic number.

163231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163231220 is an abundant number, since it is smaller than the sum of its proper divisors (180006388).

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

163231220 is a wasteful number, since it uses less digits than its factorization.

163231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10771 (or 10769 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 163231220 is about 12776.1973998526. The cubic root of 163231220 is about 546.5137279553.

Adding to 163231220 its reverse (22132361), we get a palindrome (185363581).

The spelling of 163231220 in words is "one hundred sixty-three million, two hundred thirty-one thousand, two hundred twenty".