20540364252637 has 12 divisors (see below), whose sum is σ = 21162128674260. Its totient is φ = 19936355112576.

The previous prime is 20540364252599. The next prime is 20540364252673. The reversal of 20540364252637 is 73625246304502.

It can be written as a sum of positive squares in 6 ways, for example, as 10037877764121 + 10502486488516 = 3168261^2 + 3240754^2 .

It is not a de Polignac number, because 20540364252637 - 2¹⁹ = 20540363728349 is a prime.

It is a super-2 number, since 2×20540364252637² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540364252677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17782278 + ... + 18902119.

It is an arithmetic number, because the mean of its divisors is an integer number (1763510722855).

Almost surely, 2^{20540364252637} is an apocalyptic number.

It is an amenable number.

20540364252637 is a deficient number, since it is larger than the sum of its proper divisors (621764421623).

20540364252637 is an equidigital number, since it uses as much as digits as its factorization.

20540364252637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36684880 (or 36684843 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 49.

The spelling of 20540364252637 in words is "twenty trillion, five hundred forty billion, three hundred sixty-four million, two hundred fifty-two thousand, six hundred thirty-seven".