18520020 has 72 divisors (see below), whose sum is σ = 58007040. Its totient is φ = 4777920.

The previous prime is 18520001. The next prime is 18520031. The reversal of 18520020 is 2002581.

It is a super-2 number, since 2×18520020² = 685982281600800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18519975 and 18520002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3921 + ... + 7239.

Almost surely, 2^18520020 is an apocalyptic number.

18520020 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 18520020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29003520).

18520020 is an abundant number, since it is smaller than the sum of its proper divisors (39487020).

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

18520020 is a wasteful number, since it uses less digits than its factorization.

18520020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365 (or 3360 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 18520020 is about 4303.4892819664. The cubic root of 18520020 is about 264.5739921613.

The spelling of 18520020 in words is "eighteen million, five hundred twenty thousand, twenty".