18946980 has 96 divisors (see below), whose sum is σ = 63504000. Its totient is φ = 4662144.

The previous prime is 18946973. The next prime is 18946999. The reversal of 18946980 is 8964981.

18946980 is a `hidden beast` number, since 189 + 469 + 8 + 0 = 666.

It is a super-2 number, since 2×18946980² = 717976102240800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5671 + ... + 8369.

It is an arithmetic number, because the mean of its divisors is an integer number (661500).

Almost surely, 2^18946980 is an apocalyptic number.

18946980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18946980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31752000).

18946980 is an abundant number, since it is smaller than the sum of its proper divisors (44557020).

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

18946980 is a wasteful number, since it uses less digits than its factorization.

18946980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18946980 is about 4352.8128836420. The cubic root of 18946980 is about 266.5917254691.

The spelling of 18946980 in words is "eighteen million, nine hundred forty-six thousand, nine hundred eighty".