20826650389 has 2 divisors, whose sum is σ = 20826650390. Its totient is φ = 20826650388.

The previous prime is 20826650287. The next prime is 20826650431. The reversal of 20826650389 is 98305662802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19952975025 + 873675364 = 141255^2 + 29558^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826650389 - 2²³ = 20818261781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20896650389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413325194 + 10413325195.

It is an arithmetic number, because the mean of its divisors is an integer number (10413325195).

Almost surely, 2^20826650389 is an apocalyptic number.

It is an amenable number.

20826650389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826650389 is an equidigital number, since it uses as much as digits as its factorization.

20826650389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 20826650389 in words is "twenty billion, eight hundred twenty-six million, six hundred fifty thousand, three hundred eighty-nine".