20904099 has 16 divisors (see below), whose sum is σ = 28981920. Its totient is φ = 13386240.

The previous prime is 20904089. The next prime is 20904119. The reversal of 20904099 is 99040902.

It is a happy number.

It is not a de Polignac number, because 20904099 - 2²⁰ = 19855523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20904019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20469 + ... + 21465.

It is an arithmetic number, because the mean of its divisors is an integer number (1811370).

Almost surely, 2^20904099 is an apocalyptic number.

20904099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20904099 is a deficient number, since it is larger than the sum of its proper divisors (8077821).

20904099 is a wasteful number, since it uses less digits than its factorization.

20904099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 20904099 is about 4572.1000645218. The cubic root of 20904099 is about 275.4718027626.

The spelling of 20904099 in words is "twenty million, nine hundred four thousand, ninety-nine".