20390364 has 36 divisors (see below), whose sum is σ = 53322360. Its totient is φ = 6562080.

The previous prime is 20390353. The next prime is 20390399. The reversal of 20390364 is 46309302.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8722 + ... + 10809.

Almost surely, 2^20390364 is an apocalyptic number.

It is an amenable number.

20390364 is an abundant number, since it is smaller than the sum of its proper divisors (32931996).

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

20390364 is a wasteful number, since it uses less digits than its factorization.

20390364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19570 (or 19565 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20390364 is about 4515.5690671276. The cubic root of 20390364 is about 273.1964130159.

Adding to 20390364 its reverse (46309302), we get a palindrome (66699666).

The spelling of 20390364 in words is "twenty million, three hundred ninety thousand, three hundred sixty-four".