18890980 has 24 divisors (see below), whose sum is σ = 39764088. Its totient is φ = 7538688.

The previous prime is 18890969. The next prime is 18890983. The reversal of 18890980 is 8909881.

It can be written as a sum of positive squares in 4 ways, for example, as 2439844 + 16451136 = 1562^2 + 4056^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10722 + ... + 12358.

It is an arithmetic number, because the mean of its divisors is an integer number (1656837).

Almost surely, 2^18890980 is an apocalyptic number.

18890980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18890980 is an abundant number, since it is smaller than the sum of its proper divisors (20873108).

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

18890980 is a wasteful number, since it uses less digits than its factorization.

18890980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223 (or 2221 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 18890980 is about 4346.3755014955. The cubic root of 18890980 is about 266.3288186788.

The spelling of 18890980 in words is "eighteen million, eight hundred ninety thousand, nine hundred eighty".