20611934785 has 16 divisors (see below), whose sum is σ = 26650337616. Its totient is φ = 15213477888.

The previous prime is 20611934743. The next prime is 20611934789. The reversal of 20611934785 is 58743911602.

It can be written as a sum of positive squares in 8 ways, for example, as 244078129 + 20367856656 = 15623^2 + 142716^2 .

It is a 3-Lehmer number, since φ(20611934785) divides (20611934785-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20611934785 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20611934789) 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, 52497 + ... + 209713.

It is an arithmetic number, because the mean of its divisors is an integer number (1665646101).

It is a 2-persistent number, because it is pandigital, and so is 2⋅20611934785 = 41223869570, but 3⋅20611934785 = 61835804355 is not.

Almost surely, 2^20611934785 is an apocalyptic number.

It is an amenable number.

20611934785 is a deficient number, since it is larger than the sum of its proper divisors (6038402831).

20611934785 is a wasteful number, since it uses less digits than its factorization.

20611934785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159252.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 20611934785 in words is "twenty billion, six hundred eleven million, nine hundred thirty-four thousand, seven hundred eighty-five".