18247820 has 12 divisors (see below), whose sum is σ = 38320464. Its totient is φ = 7299120.

The previous prime is 18247819. The next prime is 18247837. The reversal of 18247820 is 2874281.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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, 456176 + ... + 456215.

It is an arithmetic number, because the mean of its divisors is an integer number (3193372).

Almost surely, 2^18247820 is an apocalyptic number.

18247820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18247820 is an abundant number, since it is smaller than the sum of its proper divisors (20072644).

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

18247820 is a wasteful number, since it uses less digits than its factorization.

18247820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912400 (or 912398 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 18247820 is about 4271.7467153379. The cubic root of 18247820 is about 263.2713878043.

The spelling of 18247820 in words is "eighteen million, two hundred forty-seven thousand, eight hundred twenty".