18301980 has 24 divisors (see below), whose sum is σ = 51245712. Its totient is φ = 4880512.

The previous prime is 18301963. The next prime is 18301981. The reversal of 18301980 is 8910381.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18301981) 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, 152457 + ... + 152576.

It is an arithmetic number, because the mean of its divisors is an integer number (2135238).

Almost surely, 2^18301980 is an apocalyptic number.

18301980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18301980 is an abundant number, since it is smaller than the sum of its proper divisors (32943732).

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

18301980 is a wasteful number, since it uses less digits than its factorization.

18301980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305045 (or 305043 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 18301980 is about 4278.0813456502. The cubic root of 18301980 is about 263.5315959601.

The spelling of 18301980 in words is "eighteen million, three hundred one thousand, nine hundred eighty".