18493020 has 144 divisors (see below), whose sum is σ = 69101760. Its totient is φ = 3898368.

The previous prime is 18493001. The next prime is 18493021. The reversal of 18493020 is 2039481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18493021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15816 + ... + 16944.

Almost surely, 2^18493020 is an apocalyptic number.

18493020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18493020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34550880).

18493020 is an abundant number, since it is smaller than the sum of its proper divisors (50608740).

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

18493020 is a wasteful number, since it uses less digits than its factorization.

18493020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1159 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18493020 is about 4300.3511484529. The cubic root of 18493020 is about 264.4453570939.

The spelling of 18493020 in words is "eighteen million, four hundred ninety-three thousand, twenty".