20810720873 has 12 divisors (see below), whose sum is σ = 21817761168. Its totient is φ = 19848366120.

The previous prime is 20810720857. The next prime is 20810720893. The reversal of 20810720873 is 37802701802.

It is not a de Polignac number, because 20810720873 - 2⁴ = 20810720857 is a prime.

It is a super-2 number, since 2×20810720873² (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 (20810720803) 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 11 ways as a sum of consecutive naturals, for example, 126878 + ... + 240248.

It is an arithmetic number, because the mean of its divisors is an integer number (1818146764).

Almost surely, 2^20810720873 is an apocalyptic number.

20810720873 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20810720873 is a deficient number, since it is larger than the sum of its proper divisors (1007040295).

20810720873 is a wasteful number, since it uses less digits than its factorization.

20810720873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113764 (or 113741 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 20810720873 in words is "twenty billion, eight hundred ten million, seven hundred twenty thousand, eight hundred seventy-three".