20684905355 has 16 divisors (see below), whose sum is σ = 25143246720. Its totient is φ = 16333804032.

The previous prime is 20684905333. The next prime is 20684905361. The reversal of 20684905355 is 55350948602.

It is a cyclic number.

It is not a de Polignac number, because 20684905355 - 2³⁰ = 19611163531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2229887 + ... + 2239143.

It is an arithmetic number, because the mean of its divisors is an integer number (1571452920).

Almost surely, 2^20684905355 is an apocalyptic number.

20684905355 is a deficient number, since it is larger than the sum of its proper divisors (4458341365).

20684905355 is an equidigital number, since it uses as much as digits as its factorization.

20684905355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14998.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 20684905355 in words is "twenty billion, six hundred eighty-four million, nine hundred five thousand, three hundred fifty-five".