18693220 has 48 divisors (see below), whose sum is σ = 48319488. Its totient is φ = 5915520.

The previous prime is 18693209. The next prime is 18693247. The reversal of 18693220 is 2239681.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3316 + ... + 6955.

It is an arithmetic number, because the mean of its divisors is an integer number (1006656).

Almost surely, 2^18693220 is an apocalyptic number.

18693220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18693220 is an abundant number, since it is smaller than the sum of its proper divisors (29626268).

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

18693220 is a wasteful number, since it uses less digits than its factorization.

18693220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10300 (or 10298 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18693220 is about 4323.5656581114. The cubic root of 18693220 is about 265.3962033512.

The spelling of 18693220 in words is "eighteen million, six hundred ninety-three thousand, two hundred twenty".