20696776109 has 4 divisors (see below), whose sum is σ = 21364414080. Its totient is φ = 20029138140.

The previous prime is 20696776103. The next prime is 20696776117. The reversal of 20696776109 is 90167769602.

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 20696776109 - 2¹² = 20696772013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20696776103) 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, 333818939 + ... + 333819000.

It is an arithmetic number, because the mean of its divisors is an integer number (5341103520).

Almost surely, 2^20696776109 is an apocalyptic number.

It is an amenable number.

20696776109 is a deficient number, since it is larger than the sum of its proper divisors (667637971).

20696776109 is an equidigital number, since it uses as much as digits as its factorization.

20696776109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667637970.

The product of its (nonzero) digits is 1714608, while the sum is 53.

The spelling of 20696776109 in words is "twenty billion, six hundred ninety-six million, seven hundred seventy-six thousand, one hundred nine".