18485820 has 60 divisors (see below), whose sum is σ = 57995784. Its totient is φ = 4929120.

The previous prime is 18485809. The next prime is 18485833. The reversal of 18485820 is 2858481.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4086 + ... + 7325.

Almost surely, 2^18485820 is an apocalyptic number.

18485820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18485820 is an abundant number, since it is smaller than the sum of its proper divisors (39509964).

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

18485820 is a wasteful number, since it uses less digits than its factorization.

18485820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11432 (or 11421 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 18485820 is about 4299.5139260154. The cubic root of 18485820 is about 264.4110332657.

The spelling of 18485820 in words is "eighteen million, four hundred eighty-five thousand, eight hundred twenty".