20403240463 has 2 divisors, whose sum is σ = 20403240464. Its totient is φ = 20403240462.

The previous prime is 20403240461. The next prime is 20403240467. The reversal of 20403240463 is 36404230402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20403240463 - 2¹ = 20403240461 is a prime.

Together with 20403240461, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403240461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201620231 + 10201620232.

It is an arithmetic number, because the mean of its divisors is an integer number (10201620232).

Almost surely, 2^20403240463 is an apocalyptic number.

20403240463 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403240463 is an equidigital number, since it uses as much as digits as its factorization.

20403240463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 20403240463 its reverse (36404230402), we get a palindrome (56807470865).

The spelling of 20403240463 in words is "twenty billion, four hundred three million, two hundred forty thousand, four hundred sixty-three".