20702108409 has 4 divisors (see below), whose sum is σ = 27602811216. Its totient is φ = 13801405604.

The previous prime is 20702108389. The next prime is 20702108467. The reversal of 20702108409 is 90480120702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20702108409 - 2⁹ = 20702107897 is a prime.

It is a super-2 number, since 2×20702108409² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20702108409.

It is not an unprimeable number, because it can be changed into a prime (20702128409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3450351399 + ... + 3450351404.

It is an arithmetic number, because the mean of its divisors is an integer number (6900702804).

Almost surely, 2^20702108409 is an apocalyptic number.

It is an amenable number.

20702108409 is a deficient number, since it is larger than the sum of its proper divisors (6900702807).

20702108409 is an equidigital number, since it uses as much as digits as its factorization.

20702108409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900702806.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 20702108409 in words is "twenty billion, seven hundred two million, one hundred eight thousand, four hundred nine".