20800672491 has 16 divisors (see below), whose sum is σ = 28194440480. Its totient is φ = 13637099520.

The previous prime is 20800672483. The next prime is 20800672511. The reversal of 20800672491 is 19427600802.

It is not a de Polignac number, because 20800672491 - 2³ = 20800672483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20800672421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1418091 + ... + 1432683.

It is an arithmetic number, because the mean of its divisors is an integer number (1762152530).

Almost surely, 2^20800672491 is an apocalyptic number.

20800672491 is a deficient number, since it is larger than the sum of its proper divisors (7393767989).

20800672491 is a wasteful number, since it uses less digits than its factorization.

20800672491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22446.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 20800672491 in words is "twenty billion, eight hundred million, six hundred seventy-two thousand, four hundred ninety-one".