18880020 has 48 divisors (see below), whose sum is σ = 58739520. Its totient is φ = 5034528.

The previous prime is 18880019. The next prime is 18880021. The reversal of 18880020 is 2008881.

It is an interprime number because it is at equal distance from previous prime (18880019) and next prime (18880021).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18880021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16942 + ... + 18021.

It is an arithmetic number, because the mean of its divisors is an integer number (1223740).

Almost surely, 2^18880020 is an apocalyptic number.

18880020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18880020 is an abundant number, since it is smaller than the sum of its proper divisors (39859500).

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

18880020 is a wasteful number, since it uses less digits than its factorization.

18880020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34981 (or 34973 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 18880020 is about 4345.1144979160. The cubic root of 18880020 is about 266.2773032901.

It can be divided in two parts, 188 and 80020, that added together give a palindrome (80208).

The spelling of 18880020 in words is "eighteen million, eight hundred eighty thousand, twenty".