20839099905 has 64 divisors (see below), whose sum is σ = 40098240000. Its totient is φ = 10207524096.

The previous prime is 20839099891. The next prime is 20839099913. The reversal of 20839099905 is 50999093802.

It is not a de Polignac number, because 20839099905 - 2⁵ = 20839099873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 319411 + ... + 379079.

It is an arithmetic number, because the mean of its divisors is an integer number (626535000).

Almost surely, 2^20839099905 is an apocalyptic number.

It is an amenable number.

20839099905 is a deficient number, since it is larger than the sum of its proper divisors (19259140095).

20839099905 is a wasteful number, since it uses less digits than its factorization.

20839099905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59895 (or 59889 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 20839099905 in words is "twenty billion, eight hundred thirty-nine million, ninety-nine thousand, nine hundred five".