20001245305 has 8 divisors (see below), whose sum is σ = 24010153992. Its totient is φ = 15995223168.

The previous prime is 20001245269. The next prime is 20001245321. The reversal of 20001245305 is 50354210002.

It can be written as a sum of positive squares in 4 ways, for example, as 296666176 + 19704579129 = 17224^2 + 140373^2 .

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 20001245305 - 2¹⁷ = 20001114233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706362 + ... + 734131.

It is an arithmetic number, because the mean of its divisors is an integer number (3001269249).

Almost surely, 2^20001245305 is an apocalyptic number.

It is an amenable number.

20001245305 is a deficient number, since it is larger than the sum of its proper divisors (4008908687).

20001245305 is a wasteful number, since it uses less digits than its factorization.

20001245305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443275.

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 20001245305 its reverse (50354210002), we get a palindrome (70355455307).

The spelling of 20001245305 in words is "twenty billion, one million, two hundred forty-five thousand, three hundred five".