20479844146 has 16 divisors (see below), whose sum is σ = 32523523200. Its totient is φ = 9644900688.

The previous prime is 20479844141. The next prime is 20479844159. The reversal of 20479844146 is 64144897402.

It is a self number, because there is not a number n which added to its sum of digits gives 20479844146.

It is not an unprimeable number, because it can be changed into a prime (20479844141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551066 + ... + 1564213.

It is an arithmetic number, because the mean of its divisors is an integer number (2032720200).

Almost surely, 2^20479844146 is an apocalyptic number.

20479844146 is a deficient number, since it is larger than the sum of its proper divisors (12043679054).

20479844146 is a wasteful number, since it uses less digits than its factorization.

20479844146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115473.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 20479844146 in words is "twenty billion, four hundred seventy-nine million, eight hundred forty-four thousand, one hundred forty-six".