20180444769 has 6 divisors (see below), whose sum is σ = 29149531346. Its totient is φ = 13453629840.

The previous prime is 20180444761. The next prime is 20180444797. The reversal of 20180444769 is 96744408102.

20180444769 is a `hidden beast` number, since 20 + 180 + 4 + 447 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10554480225 + 9625964544 = 102735^2 + 98112^2 .

It is not a de Polignac number, because 20180444769 - 2³ = 20180444761 is a prime.

It is a super-2 number, since 2×20180444769² (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 (20180444761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1121135812 + ... + 1121135829.

Almost surely, 2^20180444769 is an apocalyptic number.

It is an amenable number.

20180444769 is a deficient number, since it is larger than the sum of its proper divisors (8969086577).

20180444769 is a wasteful number, since it uses less digits than its factorization.

20180444769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242271647 (or 2242271644 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 20180444769 in words is "twenty billion, one hundred eighty million, four hundred forty-four thousand, seven hundred sixty-nine".