20456040604487 has 2 divisors, whose sum is σ = 20456040604488. Its totient is φ = 20456040604486.

The previous prime is 20456040604369. The next prime is 20456040604537. The reversal of 20456040604487 is 78440604065402.

It is an a-pointer prime, because the next prime (20456040604537) can be obtained adding 20456040604487 to its sum of digits (50).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20456040604487 - 2¹⁶ = 20456040538951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20456040601487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228020302243 + 10228020302244.

It is an arithmetic number, because the mean of its divisors is an integer number (10228020302244).

Almost surely, 2^{20456040604487} is an apocalyptic number.

20456040604487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456040604487 is an equidigital number, since it uses as much as digits as its factorization.

20456040604487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5160960, while the sum is 50.

Adding to 20456040604487 its reverse (78440604065402), we get a palindrome (98896644669889).

The spelling of 20456040604487 in words is "twenty trillion, four hundred fifty-six billion, forty million, six hundred four thousand, four hundred eighty-seven".