20939900689 has 16 divisors (see below), whose sum is σ = 22175280000. Its totient is φ = 19743292800.

The previous prime is 20939900669. The next prime is 20939900701. The reversal of 20939900689 is 98600993902.

It is not a de Polignac number, because 20939900689 - 2¹⁹ = 20939376401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20939900659) 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, 217837 + ... + 298885.

It is an arithmetic number, because the mean of its divisors is an integer number (1385955000).

Almost surely, 2^20939900689 is an apocalyptic number.

20939900689 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20939900689 is a deficient number, since it is larger than the sum of its proper divisors (1235379311).

20939900689 is a wasteful number, since it uses less digits than its factorization.

20939900689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81288.

The product of its (nonzero) digits is 1889568, while the sum is 55.

The spelling of 20939900689 in words is "twenty billion, nine hundred thirty-nine million, nine hundred thousand, six hundred eighty-nine".