20864353789 has 2 divisors, whose sum is σ = 20864353790. Its totient is φ = 20864353788.

The previous prime is 20864353781. The next prime is 20864353799. The reversal of 20864353789 is 98735346802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20195252100 + 669101689 = 142110^2 + 25867^2 .

It is a cyclic number.

It is not a de Polignac number, because 20864353789 - 2³ = 20864353781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20864353781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10432176894 + 10432176895.

It is an arithmetic number, because the mean of its divisors is an integer number (10432176895).

Almost surely, 2^20864353789 is an apocalyptic number.

It is an amenable number.

20864353789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20864353789 is an equidigital number, since it uses as much as digits as its factorization.

20864353789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 20864353789 in words is "twenty billion, eight hundred sixty-four million, three hundred fifty-three thousand, seven hundred eighty-nine".