18980336 has 20 divisors (see below), whose sum is σ = 38374032. Its totient is φ = 9077376.

The previous prime is 18980323. The next prime is 18980341. The reversal of 18980336 is 63308981.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18980336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25421 + ... + 26156.

Almost surely, 2^18980336 is an apocalyptic number.

18980336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18980336 is an abundant number, since it is smaller than the sum of its proper divisors (19393696).

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

18980336 is a wasteful number, since it uses less digits than its factorization.

18980336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51608 (or 51602 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18980336 is about 4356.6427441322. The cubic root of 18980336 is about 266.7480779210.

The spelling of 18980336 in words is "eighteen million, nine hundred eighty thousand, three hundred thirty-six".