20456040604463 has 4 divisors (see below), whose sum is σ = 20461358009040. Its totient is φ = 20450723199888.

The previous prime is 20456040604369. The next prime is 20456040604487. The reversal of 20456040604463 is 36440604065402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20456040604463 is a prime.

It is a super-2 number, since 2×20456040604463² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456040604063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2658696518 + ... + 2658704211.

It is an arithmetic number, because the mean of its divisors is an integer number (5115339502260).

Almost surely, 2^{20456040604463} is an apocalyptic number.

20456040604463 is a deficient number, since it is larger than the sum of its proper divisors (5317404577).

20456040604463 is an equidigital number, since it uses as much as digits as its factorization.

20456040604463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317404576.

The product of its (nonzero) digits is 1658880, while the sum is 44.

Adding to 20456040604463 its reverse (36440604065402), we get a palindrome (56896644669865).

The spelling of 20456040604463 in words is "twenty trillion, four hundred fifty-six billion, forty million, six hundred four thousand, four hundred sixty-three".