20904731099 has 8 divisors (see below), whose sum is σ = 23950703328. Its totient is φ = 17873654400.

The previous prime is 20904731093. The next prime is 20904731123. The reversal of 20904731099 is 99013740902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20904731099 - 2⁴ = 20904731083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20904731093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3720872 + ... + 3726485.

It is an arithmetic number, because the mean of its divisors is an integer number (2993837916).

Almost surely, 2^20904731099 is an apocalyptic number.

20904731099 is a deficient number, since it is larger than the sum of its proper divisors (3045972229).

20904731099 is an equidigital number, since it uses as much as digits as its factorization.

20904731099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7447765.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 20904731099 in words is "twenty billion, nine hundred four million, seven hundred thirty-one thousand, ninety-nine".