20403211634287 has 2 divisors, whose sum is σ = 20403211634288. Its totient is φ = 20403211634286.

The previous prime is 20403211634263. The next prime is 20403211634353. The reversal of 20403211634287 is 78243611230402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20403211634287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403211634257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201605817143 + 10201605817144.

It is an arithmetic number, because the mean of its divisors is an integer number (10201605817144).

Almost surely, 2^{20403211634287} is an apocalyptic number.

20403211634287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403211634287 is an equidigital number, since it uses as much as digits as its factorization.

20403211634287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 43.

Adding to 20403211634287 its reverse (78243611230402), we get a palindrome (98646822864689).

The spelling of 20403211634287 in words is "twenty trillion, four hundred three billion, two hundred eleven million, six hundred thirty-four thousand, two hundred eighty-seven".