20494579896 has 48 divisors (see below), whose sum is σ = 63435606000. Its totient is φ = 5855594112.

The previous prime is 20494579873. The next prime is 20494579907. The reversal of 20494579896 is 69897549402.

20494579896 is a `hidden beast` number, since 2 + 0 + 4 + 9 + 457 + 98 + 96 = 666.

It is a super-2 number, since 2×20494579896² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

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, 20331421 + ... + 20332428.

It is an arithmetic number, because the mean of its divisors is an integer number (1321575125).

Almost surely, 2^20494579896 is an apocalyptic number.

It is an amenable number.

20494579896 is an abundant number, since it is smaller than the sum of its proper divisors (42941026104).

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

20494579896 is a wasteful number, since it uses less digits than its factorization.

20494579896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40663868 (or 40663861 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 20494579896 in words is "twenty billion, four hundred ninety-four million, five hundred seventy-nine thousand, eight hundred ninety-six".