20507300321 has 4 divisors (see below), whose sum is σ = 20508452100. Its totient is φ = 20506148544.

The previous prime is 20507300293. The next prime is 20507300347. The reversal of 20507300321 is 12300370502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11207398225 + 9299902096 = 105865^2 + 96436^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507300321 - 2¹⁸ = 20507038177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20507320321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548756 + ... + 584933.

It is an arithmetic number, because the mean of its divisors is an integer number (5127113025).

Almost surely, 2^20507300321 is an apocalyptic number.

It is an amenable number.

20507300321 is a deficient number, since it is larger than the sum of its proper divisors (1151779).

20507300321 is a wasteful number, since it uses less digits than its factorization.

20507300321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151778.

The product of its (nonzero) digits is 1260, while the sum is 23.

Adding to 20507300321 its reverse (12300370502), we get a palindrome (32807670823).

The spelling of 20507300321 in words is "twenty billion, five hundred seven million, three hundred thousand, three hundred twenty-one".