20863834457 has 2 divisors, whose sum is σ = 20863834458. Its totient is φ = 20863834456.

The previous prime is 20863834421. The next prime is 20863834463. The reversal of 20863834457 is 75443836802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18456852736 + 2406981721 = 135856^2 + 49061^2 .

It is a cyclic number.

It is not a de Polignac number, because 20863834457 - 2¹⁶ = 20863768921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20863834157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431917228 + 10431917229.

It is an arithmetic number, because the mean of its divisors is an integer number (10431917229).

Almost surely, 2^20863834457 is an apocalyptic number.

It is an amenable number.

20863834457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20863834457 is an equidigital number, since it uses as much as digits as its factorization.

20863834457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 50.

The spelling of 20863834457 in words is "twenty billion, eight hundred sixty-three million, eight hundred thirty-four thousand, four hundred fifty-seven".