20026039681 has 2 divisors, whose sum is σ = 20026039682. Its totient is φ = 20026039680.

The previous prime is 20026039673. The next prime is 20026039741. The reversal of 20026039681 is 18693062002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18655189056 + 1370850625 = 136584^2 + 37025^2 .

It is a cyclic number.

It is not a de Polignac number, because 20026039681 - 2³ = 20026039673 is a prime.

It is a super-4 number, since 4×20026039681⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20026039681.

It is not a weakly prime, because it can be changed into another prime (20026039381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10013019840 + 10013019841.

It is an arithmetic number, because the mean of its divisors is an integer number (10013019841).

Almost surely, 2^20026039681 is an apocalyptic number.

It is an amenable number.

20026039681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20026039681 is an equidigital number, since it uses as much as digits as its factorization.

20026039681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 20026039681 in words is "twenty billion, twenty-six million, thirty-nine thousand, six hundred eighty-one".