20106346789 has 4 divisors (see below), whose sum is σ = 20194147660. Its totient is φ = 20018545920.

The previous prime is 20106346769. The next prime is 20106346807. The reversal of 20106346789 is 98764360102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18213661764 + 1892685025 = 134958^2 + 43505^2 .

It is a cyclic number.

It is not a de Polignac number, because 20106346789 - 2²¹ = 20104249637 is a prime.

It is a super-2 number, since 2×20106346789² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20106346739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43900092 + ... + 43900549.

It is an arithmetic number, because the mean of its divisors is an integer number (5048536915).

Almost surely, 2^20106346789 is an apocalyptic number.

It is an amenable number.

20106346789 is a deficient number, since it is larger than the sum of its proper divisors (87800871).

20106346789 is an equidigital number, since it uses as much as digits as its factorization.

20106346789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87800870.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 20106346789 in words is "twenty billion, one hundred six million, three hundred forty-six thousand, seven hundred eighty-nine".