20858317100 has 36 divisors (see below), whose sum is σ = 46485868464. Its totient is φ = 8117830080.

The previous prime is 20858317079. The next prime is 20858317147. The reversal of 20858317100 is 171385802.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2814992 + ... + 2822391.

It is an arithmetic number, because the mean of its divisors is an integer number (1291274124).

Almost surely, 2^20858317100 is an apocalyptic number.

20858317100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20858317100 is an abundant number, since it is smaller than the sum of its proper divisors (25627551364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20858317100 is a wasteful number, since it uses less digits than its factorization.

20858317100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5637434 (or 5637427 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 20858317100 in words is "twenty billion, eight hundred fifty-eight million, three hundred seventeen thousand, one hundred".