20429807685 has 16 divisors (see below), whose sum is σ = 37357362816. Its totient is φ = 9339340608.

The previous prime is 20429807677. The next prime is 20429807687. The reversal of 20429807685 is 58670892402.

It is not a de Polignac number, because 20429807685 - 2³ = 20429807677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20429807687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97284694 + ... + 97284903.

It is an arithmetic number, because the mean of its divisors is an integer number (2334835176).

Almost surely, 2^20429807685 is an apocalyptic number.

It is an amenable number.

20429807685 is a deficient number, since it is larger than the sum of its proper divisors (16927555131).

20429807685 is a wasteful number, since it uses less digits than its factorization.

20429807685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194569612.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 20429807685 in words is "twenty billion, four hundred twenty-nine million, eight hundred seven thousand, six hundred eighty-five".