20627986844669 has 2 divisors, whose sum is σ = 20627986844670. Its totient is φ = 20627986844668.

The previous prime is 20627986844639. The next prime is 20627986844783. The reversal of 20627986844669 is 96644868972602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11790227016100 + 8837759828569 = 3433690^2 + 2972837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20627986844669 is a prime.

It is a super-2 number, since 2×20627986844669² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20627986844669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20627986844639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10313993422334 + 10313993422335.

It is an arithmetic number, because the mean of its divisors is an integer number (10313993422335).

Almost surely, 2^{20627986844669} is an apocalyptic number.

It is an amenable number.

20627986844669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20627986844669 is an equidigital number, since it uses as much as digits as its factorization.

20627986844669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3009871872, while the sum is 77.

The spelling of 20627986844669 in words is "twenty trillion, six hundred twenty-seven billion, nine hundred eighty-six million, eight hundred forty-four thousand, six hundred sixty-nine".