20448500645 has 16 divisors (see below), whose sum is σ = 24798935280. Its totient is φ = 16185083904.

The previous prime is 20448500641. The next prime is 20448500707. The reversal of 20448500645 is 54600584402.

It can be written as a sum of positive squares in 8 ways, for example, as 812364004 + 19636136641 = 28502^2 + 140129^2 .

It is a cyclic number.

It is not a de Polignac number, because 20448500645 - 2² = 20448500641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20448500599 and 20448500608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448500641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2621411 + ... + 2629199.

It is an arithmetic number, because the mean of its divisors is an integer number (1549933455).

Almost surely, 2^20448500645 is an apocalyptic number.

It is an amenable number.

20448500645 is a deficient number, since it is larger than the sum of its proper divisors (4350434635).

20448500645 is an equidigital number, since it uses as much as digits as its factorization.

20448500645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13304.

The product of its (nonzero) digits is 153600, while the sum is 38.

The spelling of 20448500645 in words is "twenty billion, four hundred forty-eight million, five hundred thousand, six hundred forty-five".