20391106769 has 4 divisors (see below), whose sum is σ = 22244843760. Its totient is φ = 18537369780.

The previous prime is 20391106733. The next prime is 20391106877. The reversal of 20391106769 is 96760119302.

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 20391106769 - 2¹² = 20391102673 is a prime.

It is a super-2 number, since 2×20391106769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20391106969) 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, 926868479 + ... + 926868500.

It is an arithmetic number, because the mean of its divisors is an integer number (5561210940).

Almost surely, 2^20391106769 is an apocalyptic number.

It is an amenable number.

20391106769 is a deficient number, since it is larger than the sum of its proper divisors (1853736991).

20391106769 is a wasteful number, since it uses less digits than its factorization.

20391106769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853736990.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 20391106769 in words is "twenty billion, three hundred ninety-one million, one hundred six thousand, seven hundred sixty-nine".