20735668231 has 2 divisors, whose sum is σ = 20735668232. Its totient is φ = 20735668230.

The previous prime is 20735668223. The next prime is 20735668237. The reversal of 20735668231 is 13286653702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20735668231 - 2³ = 20735668223 is a prime.

It is a super-2 number, since 2×20735668231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20735668237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10367834115 + 10367834116.

It is an arithmetic number, because the mean of its divisors is an integer number (10367834116).

Almost surely, 2^20735668231 is an apocalyptic number.

20735668231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20735668231 is an equidigital number, since it uses as much as digits as its factorization.

20735668231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 20735668231 in words is "twenty billion, seven hundred thirty-five million, six hundred sixty-eight thousand, two hundred thirty-one".