20627986844639 has 2 divisors, whose sum is σ = 20627986844640. Its totient is φ = 20627986844638.

The previous prime is 20627986844623. The next prime is 20627986844669. The reversal of 20627986844639 is 93644868972602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20627986844639 - 2⁴ = 20627986844623 is a prime.

It is a super-3 number, since 3×20627986844639³ (a number of 41 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20627986844669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10313993422319 + 10313993422320.

It is an arithmetic number, because the mean of its divisors is an integer number (10313993422320).

Almost surely, 2^{20627986844639} is an apocalyptic number.

20627986844639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20627986844639 is an equidigital number, since it uses as much as digits as its factorization.

20627986844639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1504935936, while the sum is 74.

The spelling of 20627986844639 in words is "twenty trillion, six hundred twenty-seven billion, nine hundred eighty-six million, eight hundred forty-four thousand, six hundred thirty-nine".