20494579872 has 96 divisors (see below), whose sum is σ = 58010904000. Its totient is φ = 6297937920.

The previous prime is 20494579813. The next prime is 20494579873. The reversal of 20494579872 is 27897549402.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (20494579873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002004 + ... + 1022252.

It is an arithmetic number, because the mean of its divisors is an integer number (604280250).

Almost surely, 2^20494579872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20494579872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29005452000).

20494579872 is an abundant number, since it is smaller than the sum of its proper divisors (37516324128).

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

20494579872 is a wasteful number, since it uses less digits than its factorization.

20494579872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21086 (or 21078 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 20494579872 in words is "twenty billion, four hundred ninety-four million, five hundred seventy-nine thousand, eight hundred seventy-two".