18420764 has 12 divisors (see below), whose sum is σ = 32272800. Its totient is φ = 9199968.

The previous prime is 18420763. The next prime is 18420791. The reversal of 18420764 is 46702481.

It is a self number, because there is not a number n which added to its sum of digits gives 18420764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2477 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (2689400).

Almost surely, 2^18420764 is an apocalyptic number.

It is an amenable number.

18420764 is a deficient number, since it is larger than the sum of its proper divisors (13852036).

18420764 is a wasteful number, since it uses less digits than its factorization.

18420764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5212 (or 5210 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 18420764 is about 4291.9417517017. The cubic root of 18420764 is about 264.1004935750.

The spelling of 18420764 in words is "eighteen million, four hundred twenty thousand, seven hundred sixty-four".