20540364252638 has 16 divisors (see below), whose sum is σ = 30990858245280. Its totient is φ = 10210086662496.

The previous prime is 20540364252599. The next prime is 20540364252673. The reversal of 20540364252638 is 83625246304502.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2738231 + ... + 6969837.

It is an arithmetic number, because the mean of its divisors is an integer number (1936928640330).

Almost surely, 2^{20540364252638} is an apocalyptic number.

20540364252638 is a deficient number, since it is larger than the sum of its proper divisors (10450493992642).

20540364252638 is a wasteful number, since it uses less digits than its factorization.

20540364252638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245811.

The product of its (nonzero) digits is 8294400, while the sum is 50.

The spelling of 20540364252638 in words is "twenty trillion, five hundred forty billion, three hundred sixty-four million, two hundred fifty-two thousand, six hundred thirty-eight".