20980904269 has 4 divisors (see below), whose sum is σ = 22594819996. Its totient is φ = 19366988544.

The previous prime is 20980904251. The next prime is 20980904291. The reversal of 20980904269 is 96240908902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7180528644 + 13800375625 = 84738^2 + 117475^2 .

It is a cyclic number.

It is not a de Polignac number, because 20980904269 - 2¹¹ = 20980902221 is a prime.

It is a super-2 number, since 2×20980904269² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20980934269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806957844 + ... + 806957869.

It is an arithmetic number, because the mean of its divisors is an integer number (5648704999).

Almost surely, 2^20980904269 is an apocalyptic number.

It is an amenable number.

20980904269 is a deficient number, since it is larger than the sum of its proper divisors (1613915727).

20980904269 is a wasteful number, since it uses less digits than its factorization.

20980904269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613915726.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 20980904269 in words is "twenty billion, nine hundred eighty million, nine hundred four thousand, two hundred sixty-nine".