20040849864 has 144 divisors (see below), whose sum is σ = 63594694800. Its totient is φ = 5684624064.

The previous prime is 20040849859. The next prime is 20040849883. The reversal of 20040849864 is 46894804002.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 469959 + ... + 510825.

It is an arithmetic number, because the mean of its divisors is an integer number (441629825).

Almost surely, 2^20040849864 is an apocalyptic number.

20040849864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20040849864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31797347400).

20040849864 is an abundant number, since it is smaller than the sum of its proper divisors (43553844936).

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

20040849864 is a wasteful number, since it uses less digits than its factorization.

20040849864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41032 (or 41018 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 20040849864 in words is "twenty billion, forty million, eight hundred forty-nine thousand, eight hundred sixty-four".