20535894997 has 2 divisors, whose sum is σ = 20535894998. Its totient is φ = 20535894996.

The previous prime is 20535894959. The next prime is 20535895027. The reversal of 20535894997 is 79949853502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11500632081 + 9035262916 = 107241^2 + 95054^2 .

It is a cyclic number.

It is not a de Polignac number, because 20535894997 - 2¹⁵ = 20535862229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20535894937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267947498 + 10267947499.

It is an arithmetic number, because the mean of its divisors is an integer number (10267947499).

Almost surely, 2^20535894997 is an apocalyptic number.

It is an amenable number.

20535894997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535894997 is an equidigital number, since it uses as much as digits as its factorization.

20535894997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 20535894997 in words is "twenty billion, five hundred thirty-five million, eight hundred ninety-four thousand, nine hundred ninety-seven".