20638424488278 has 16 divisors (see below), whose sum is σ = 41317276852656. Its totient is φ = 6872736850080.

The previous prime is 20638424488267. The next prime is 20638424488301. The reversal of 20638424488278 is 87288442483602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1684488201 + ... + 1684500452.

It is an arithmetic number, because the mean of its divisors is an integer number (2582329803291).

Almost surely, 2^{20638424488278} is an apocalyptic number.

20638424488278 is an abundant number, since it is smaller than the sum of its proper divisors (20678852364378).

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

20638424488278 is a wasteful number, since it uses less digits than its factorization.

20638424488278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368989679.

The product of its (nonzero) digits is 264241152, while the sum is 66.

The spelling of 20638424488278 in words is "twenty trillion, six hundred thirty-eight billion, four hundred twenty-four million, four hundred eighty-eight thousand, two hundred seventy-eight".