20638683849309 has 16 divisors (see below), whose sum is σ = 28510749425664. Its totient is φ = 13266146012400.

The previous prime is 20638683849299. The next prime is 20638683849323. The reversal of 20638683849309 is 90394838683602.

It is not a de Polignac number, because 20638683849309 - 2⁸ = 20638683849053 is a prime.

It is a super-2 number, since 2×20638683849309² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638683849389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409423749 + ... + 409474154.

It is an arithmetic number, because the mean of its divisors is an integer number (1781921839104).

Almost surely, 2^{20638683849309} is an apocalyptic number.

It is an amenable number.

20638683849309 is a deficient number, since it is larger than the sum of its proper divisors (7872065576355).

20638683849309 is a wasteful number, since it uses less digits than its factorization.

20638683849309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818898208.

The product of its (nonzero) digits is 322486272, while the sum is 69.

The spelling of 20638683849309 in words is "twenty trillion, six hundred thirty-eight billion, six hundred eighty-three million, eight hundred forty-nine thousand, three hundred nine".