20138171072405 has 16 divisors (see below), whose sum is σ = 24762022581744. Its totient is φ = 15713274769920.

The previous prime is 20138171072347. The next prime is 20138171072419. The reversal of 20138171072405 is 50427017183102.

It can be written as a sum of positive squares in 8 ways, for example, as 10875102298564 + 9263068773841 = 3297742^2 + 3043529^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20138171072405 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent 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, 12759362 + ... + 14250531.

It is an arithmetic number, because the mean of its divisors is an integer number (1547626411359).

Almost surely, 2^{20138171072405} is an apocalyptic number.

It is an amenable number.

20138171072405 is a deficient number, since it is larger than the sum of its proper divisors (4623851509339).

20138171072405 is a wasteful number, since it uses less digits than its factorization.

20138171072405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27013576.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 20138171072405 in words is "twenty trillion, one hundred thirty-eight billion, one hundred seventy-one million, seventy-two thousand, four hundred five".