163820980 has 12 divisors (see below), whose sum is σ = 344024100. Its totient is φ = 65528384.

The previous prime is 163820977. The next prime is 163820981. The reversal of 163820980 is 89028361.

It can be written as a sum of positive squares in 2 ways, for example, as 126023076 + 37797904 = 11226^2 + 6148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163820981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4095505 + ... + 4095544.

It is an arithmetic number, because the mean of its divisors is an integer number (28668675).

Almost surely, 2^163820980 is an apocalyptic number.

163820980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163820980 is an abundant number, since it is smaller than the sum of its proper divisors (180203120).

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

163820980 is a wasteful number, since it uses less digits than its factorization.

163820980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8191058 (or 8191056 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 163820980 is about 12799.2570096861. The cubic root of 163820980 is about 547.1711278056.

The spelling of 163820980 in words is "one hundred sixty-three million, eight hundred twenty thousand, nine hundred eighty".