18820764 has 36 divisors (see below), whose sum is σ = 48386520. Its totient is φ = 6166560.

The previous prime is 18820729. The next prime is 18820771. The reversal of 18820764 is 46702881.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2307 + ... + 6554.

It is an arithmetic number, because the mean of its divisors is an integer number (1344070).

Almost surely, 2^18820764 is an apocalyptic number.

It is an amenable number.

18820764 is an abundant number, since it is smaller than the sum of its proper divisors (29565756).

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

18820764 is a wasteful number, since it uses less digits than its factorization.

18820764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8930 (or 8925 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18820764 is about 4338.2904467082. The cubic root of 18820764 is about 265.9984359303.

The spelling of 18820764 in words is "eighteen million, eight hundred twenty thousand, seven hundred sixty-four".