20684226635 has 4 divisors (see below), whose sum is σ = 24821071968. Its totient is φ = 16547381304.

The previous prime is 20684226613. The next prime is 20684226677. The reversal of 20684226635 is 53662248602.

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

It is a cyclic number.

It is not a de Polignac number, because 20684226635 - 2¹² = 20684222539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2068422659 + ... + 2068422668.

It is an arithmetic number, because the mean of its divisors is an integer number (6205267992).

Almost surely, 2^20684226635 is an apocalyptic number.

20684226635 is a deficient number, since it is larger than the sum of its proper divisors (4136845333).

20684226635 is an equidigital number, since it uses as much as digits as its factorization.

20684226635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4136845332.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 20684226635 in words is "twenty billion, six hundred eighty-four million, two hundred twenty-six thousand, six hundred thirty-five".