18900980 has 24 divisors (see below), whose sum is σ = 45362688. Its totient is φ = 6480288.

The previous prime is 18900971. The next prime is 18900983. The reversal of 18900980 is 8900981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 18900980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18900983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67364 + ... + 67643.

It is an arithmetic number, because the mean of its divisors is an integer number (1890112).

Almost surely, 2^18900980 is an apocalyptic number.

18900980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18900980 is an abundant number, since it is smaller than the sum of its proper divisors (26461708).

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

18900980 is a wasteful number, since it uses less digits than its factorization.

18900980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135023 (or 135021 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 18900980 is about 4347.5257331038. The cubic root of 18900980 is about 266.3758043899.

Subtracting from 18900980 its reverse (8900981), we obtain a palindrome (9999999).

The spelling of 18900980 in words is "eighteen million, nine hundred thousand, nine hundred eighty".