20843851875 has 160 divisors (see below), whose sum is σ = 44049899520. Its totient is φ = 8512080000.

The previous prime is 20843851843. The next prime is 20843851883. The reversal of 20843851875 is 57815834802.

It is a Cunningham number, because it is equal to 144374²-1.

It is not a de Polignac number, because 20843851875 - 2⁵ = 20843851843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 8516902 + ... + 8519348.

It is an arithmetic number, because the mean of its divisors is an integer number (275311872).

Almost surely, 2^20843851875 is an apocalyptic number.

20843851875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20843851875 is an abundant number, since it is smaller than the sum of its proper divisors (23206047645).

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

20843851875 is a wasteful number, since it uses less digits than its factorization.

20843851875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547 (or 2532 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 20843851875 in words is "twenty billion, eight hundred forty-three million, eight hundred fifty-one thousand, eight hundred seventy-five".