20479895138 has 32 divisors (see below), whose sum is σ = 32846679360. Its totient is φ = 9543306240.

The previous prime is 20479895077. The next prime is 20479895147. The reversal of 20479895138 is 83159897402.

It is a super-2 number, since 2×20479895138² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1459745 + ... + 1473707.

It is an arithmetic number, because the mean of its divisors is an integer number (1026458730).

Almost surely, 2^20479895138 is an apocalyptic number.

20479895138 is a deficient number, since it is larger than the sum of its proper divisors (12366784222).

20479895138 is a wasteful number, since it uses less digits than its factorization.

20479895138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14402.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 20479895138 in words is "twenty billion, four hundred seventy-nine million, eight hundred ninety-five thousand, one hundred thirty-eight".