20904086 has 12 divisors (see below), whose sum is σ = 36475668. Its totient is φ = 8958852.

The previous prime is 20904077. The next prime is 20904089. The reversal of 20904086 is 68040902.

It is a super-2 number, since 2×20904086² = 873961622990792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20904089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106556 + ... + 106751.

It is an arithmetic number, because the mean of its divisors is an integer number (3039639).

Almost surely, 2^20904086 is an apocalyptic number.

20904086 is a deficient number, since it is larger than the sum of its proper divisors (15571582).

20904086 is a wasteful number, since it uses less digits than its factorization.

20904086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213323 (or 213316 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20904086 is about 4572.0986428554. The cubic root of 20904086 is about 275.4717456584.

Adding to 20904086 its reverse (68040902), we get a palindrome (88944988).

The spelling of 20904086 in words is "twenty million, nine hundred four thousand, eighty-six".