20755277709 has 4 divisors (see below), whose sum is σ = 27673703616. Its totient is φ = 13836851804.

The previous prime is 20755277701. The next prime is 20755277737. The reversal of 20755277709 is 90777255702.

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 20755277709 - 2³ = 20755277701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20755277701) 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, 3459212949 + ... + 3459212954.

It is an arithmetic number, because the mean of its divisors is an integer number (6918425904).

Almost surely, 2^20755277709 is an apocalyptic number.

It is an amenable number.

20755277709 is a deficient number, since it is larger than the sum of its proper divisors (6918425907).

20755277709 is an equidigital number, since it uses as much as digits as its factorization.

20755277709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918425906.

The product of its (nonzero) digits is 2160900, while the sum is 51.

The spelling of 20755277709 in words is "twenty billion, seven hundred fifty-five million, two hundred seventy-seven thousand, seven hundred nine".