20601199769 has 4 divisors (see below), whose sum is σ = 20601486900. Its totient is φ = 20600912640.

The previous prime is 20601199747. The next prime is 20601199831. The reversal of 20601199769 is 96799110602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10565167369 + 10036032400 = 102787^2 + 100180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20601199769 is a prime.

It is a super-2 number, since 2×20601199769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20601199669) 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, 67109 + ... + 213789.

It is an arithmetic number, because the mean of its divisors is an integer number (5150371725).

Almost surely, 2^20601199769 is an apocalyptic number.

It is an amenable number.

20601199769 is a deficient number, since it is larger than the sum of its proper divisors (287131).

20601199769 is a wasteful number, since it uses less digits than its factorization.

20601199769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287130.

The product of its (nonzero) digits is 367416, while the sum is 50.

The spelling of 20601199769 in words is "twenty billion, six hundred one million, one hundred ninety-nine thousand, seven hundred sixty-nine".