20506227307 has 4 divisors (see below), whose sum is σ = 20506778656. Its totient is φ = 20505675960.

The previous prime is 20506227241. The next prime is 20506227319. The reversal of 20506227307 is 70372260502.

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

It is a cyclic number.

It is not a de Polignac number, because 20506227307 - 2³¹ = 18358743659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20506207307) 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, 215508 + ... + 295729.

It is an arithmetic number, because the mean of its divisors is an integer number (5126694664).

Almost surely, 2^20506227307 is an apocalyptic number.

20506227307 is a deficient number, since it is larger than the sum of its proper divisors (551349).

20506227307 is an equidigital number, since it uses as much as digits as its factorization.

20506227307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551348.

The product of its (nonzero) digits is 35280, while the sum is 34.

Adding to 20506227307 its reverse (70372260502), we get a palindrome (90878487809).

The spelling of 20506227307 in words is "twenty billion, five hundred six million, two hundred twenty-seven thousand, three hundred seven".