20186384 has 10 divisors (see below), whose sum is σ = 39111150. Its totient is φ = 10093184.

The previous prime is 20186381. The next prime is 20186399. The reversal of 20186384 is 48368102.

It can be written as a sum of positive squares in only one way, i.e., 17875984 + 2310400 = 4228^2 + 1520^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20186384.

It is not an unprimeable number, because it can be changed into a prime (20186381) 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 as a sum of consecutive naturals, namely, 630809 + ... + 630840.

It is an arithmetic number, because the mean of its divisors is an integer number (3911115).

Almost surely, 2^20186384 is an apocalyptic number.

It is an amenable number.

20186384 is a deficient number, since it is larger than the sum of its proper divisors (18924766).

20186384 is a wasteful number, since it uses less digits than its factorization.

20186384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261657 (or 1261651 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20186384 is about 4492.9259953843. The cubic root of 20186384 is about 272.2823624882.

The spelling of 20186384 in words is "twenty million, one hundred eighty-six thousand, three hundred eighty-four".