18790020 has 72 divisors (see below), whose sum is σ = 57482880. Its totient is φ = 4968000.

The previous prime is 18790019. The next prime is 18790027. The reversal of 18790020 is 2009781.

It is not an unprimeable number, because it can be changed into a prime (18790027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24645 + ... + 25395.

Almost surely, 2^18790020 is an apocalyptic number.

18790020 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 18790020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28741440).

18790020 is an abundant number, since it is smaller than the sum of its proper divisors (38692860).

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

18790020 is a wasteful number, since it uses less digits than its factorization.

18790020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 18790020 is about 4334.7456672797. The cubic root of 18790020 is about 265.8535195170.

The spelling of 18790020 in words is "eighteen million, seven hundred ninety thousand, twenty".