20826802693 has 2 divisors, whose sum is σ = 20826802694. Its totient is φ = 20826802692.

The previous prime is 20826802669. The next prime is 20826802741. The reversal of 20826802693 is 39620862802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16910921764 + 3915880929 = 130042^2 + 62577^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20826802693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20826802193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413401346 + 10413401347.

It is an arithmetic number, because the mean of its divisors is an integer number (10413401347).

Almost surely, 2^20826802693 is an apocalyptic number.

It is an amenable number.

20826802693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826802693 is an equidigital number, since it uses as much as digits as its factorization.

20826802693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 20826802693 in words is "twenty billion, eight hundred twenty-six million, eight hundred two thousand, six hundred ninety-three".