18920680 has 64 divisors (see below), whose sum is σ = 44452800. Its totient is φ = 7242240.

The previous prime is 18920663. The next prime is 18920701. The reversal of 18920680 is 8602981.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136051 + ... + 136189.

It is an arithmetic number, because the mean of its divisors is an integer number (694575).

Almost surely, 2^18920680 is an apocalyptic number.

18920680 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 18920680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22226400).

18920680 is an abundant number, since it is smaller than the sum of its proper divisors (25532120).

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

18920680 is a wasteful number, since it uses less digits than its factorization.

18920680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18920680 is about 4349.7907995673. The cubic root of 18920680 is about 266.4683177808.

It can be divided in two parts, 18920 and 680, that added together give a square (19600 = 140²).

The spelling of 18920680 in words is "eighteen million, nine hundred twenty thousand, six hundred eighty".