20904363 has 6 divisors (see below), whose sum is σ = 30195204. Its totient is φ = 13936236.

The previous prime is 20904343. The next prime is 20904391. The reversal of 20904363 is 36340902.

It is not a de Polignac number, because 20904363 - 2⁹ = 20903851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20904343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161345 + ... + 1161362.

It is an arithmetic number, because the mean of its divisors is an integer number (5032534).

Almost surely, 2^20904363 is an apocalyptic number.

20904363 is a deficient number, since it is larger than the sum of its proper divisors (9290841).

20904363 is a wasteful number, since it uses less digits than its factorization.

20904363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322713 (or 2322710 counting only the distinct ones).

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

The square root of 20904363 is about 4572.1289351898. The cubic root of 20904363 is about 275.4729624115.

The spelling of 20904363 in words is "twenty million, nine hundred four thousand, three hundred sixty-three".