18935820 has 36 divisors (see below), whose sum is σ = 57439200. Its totient is φ = 5049504.

The previous prime is 18935789. The next prime is 18935821. The reversal of 18935820 is 2853981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18935821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52420 + ... + 52779.

Almost surely, 2^18935820 is an apocalyptic number.

18935820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18935820 is an abundant number, since it is smaller than the sum of its proper divisors (38503380).

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

18935820 is a wasteful number, since it uses less digits than its factorization.

18935820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105214 (or 105209 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18935820 is about 4351.5307651446. The cubic root of 18935820 is about 266.5393732739.

The spelling of 18935820 in words is "eighteen million, nine hundred thirty-five thousand, eight hundred twenty".