20315305425563 has 8 divisors (see below), whose sum is σ = 20878867002240. Its totient is φ = 19752506968320.

The previous prime is 20315305425539. The next prime is 20315305425581. The reversal of 20315305425563 is 36552450351302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20315305425563 - 2²² = 20315301231259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315305425533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190725878 + ... + 190832363.

It is an arithmetic number, because the mean of its divisors is an integer number (2609858375280).

Almost surely, 2^{20315305425563} is an apocalyptic number.

20315305425563 is a deficient number, since it is larger than the sum of its proper divisors (563561576677).

20315305425563 is a wasteful number, since it uses less digits than its factorization.

20315305425563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381559717.

The product of its (nonzero) digits is 1620000, while the sum is 44.

Adding to 20315305425563 its reverse (36552450351302), we get a palindrome (56867755776865).

The spelling of 20315305425563 in words is "twenty trillion, three hundred fifteen billion, three hundred five million, four hundred twenty-five thousand, five hundred sixty-three".