20963590577 has 2 divisors, whose sum is σ = 20963590578. Its totient is φ = 20963590576.

The previous prime is 20963590517. The next prime is 20963590591. The reversal of 20963590577 is 77509536902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20956615696 + 6974881 = 144764^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 20963590577 - 2¹⁶ = 20963525041 is a prime.

It is not a weakly prime, because it can be changed into another prime (20963590507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481795288 + 10481795289.

It is an arithmetic number, because the mean of its divisors is an integer number (10481795289).

Almost surely, 2^20963590577 is an apocalyptic number.

It is an amenable number.

20963590577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20963590577 is an equidigital number, since it uses as much as digits as its factorization.

20963590577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3572100, while the sum is 53.

The spelling of 20963590577 in words is "twenty billion, nine hundred sixty-three million, five hundred ninety thousand, five hundred seventy-seven".