20935891807 has 2 divisors, whose sum is σ = 20935891808. Its totient is φ = 20935891806.

The previous prime is 20935891763. The next prime is 20935891811. The reversal of 20935891807 is 70819853902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20935891807 - 2³¹ = 18788408159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20935891007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10467945903 + 10467945904.

It is an arithmetic number, because the mean of its divisors is an integer number (10467945904).

Almost surely, 2^20935891807 is an apocalyptic number.

20935891807 is a deficient number, since it is larger than the sum of its proper divisors (1).

20935891807 is an equidigital number, since it uses as much as digits as its factorization.

20935891807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 20935891807 in words is "twenty billion, nine hundred thirty-five million, eight hundred ninety-one thousand, eight hundred seven".