20626209641 has 4 divisors (see below), whose sum is σ = 20908760532. Its totient is φ = 20343658752.

The previous prime is 20626209587. The next prime is 20626209649. The reversal of 20626209641 is 14690262602.

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 6661824400 + 13964385241 = 81620^2 + 118171^2 .

It is a cyclic number.

It is not a de Polignac number, because 20626209641 - 2²⁶ = 20559100777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20626209595 and 20626209604.

It is not an unprimeable number, because it can be changed into a prime (20626209649) 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, 141275336 + ... + 141275481.

It is an arithmetic number, because the mean of its divisors is an integer number (5227190133).

Almost surely, 2^20626209641 is an apocalyptic number.

It is an amenable number.

20626209641 is a deficient number, since it is larger than the sum of its proper divisors (282550891).

20626209641 is an equidigital number, since it uses as much as digits as its factorization.

20626209641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282550890.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 20626209641 in words is "twenty billion, six hundred twenty-six million, two hundred nine thousand, six hundred forty-one".