20563151645 has 16 divisors (see below), whose sum is σ = 25091543232. Its totient is φ = 16175228160.

The previous prime is 20563151627. The next prime is 20563151681. The reversal of 20563151645 is 54615136502.

It is not a de Polignac number, because 20563151645 - 2²⁶ = 20496042781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20563151599 and 20563151608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29852 + ... + 204981.

It is an arithmetic number, because the mean of its divisors is an integer number (1568221452).

Almost surely, 2^20563151645 is an apocalyptic number.

It is an amenable number.

20563151645 is a deficient number, since it is larger than the sum of its proper divisors (4528391587).

20563151645 is a wasteful number, since it uses less digits than its factorization.

20563151645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235132.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 20563151645 in words is "twenty billion, five hundred sixty-three million, one hundred fifty-one thousand, six hundred forty-five".