20612331305 has 8 divisors (see below), whose sum is σ = 25587721800. Its totient is φ = 15921248896.

The previous prime is 20612331293. The next prime is 20612331307. The reversal of 20612331305 is 50313321602.

It can be written as a sum of positive squares in 4 ways, for example, as 6739260649 + 13873070656 = 82093^2 + 117784^2 .

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 20612331305 - 2⁸ = 20612331049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20612331307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71076860 + ... + 71077149.

It is an arithmetic number, because the mean of its divisors is an integer number (3198465225).

Almost surely, 2^20612331305 is an apocalyptic number.

It is an amenable number.

20612331305 is a deficient number, since it is larger than the sum of its proper divisors (4975390495).

20612331305 is a wasteful number, since it uses less digits than its factorization.

20612331305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142154043.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 20612331305 its reverse (50313321602), we get a palindrome (70925652907).

The spelling of 20612331305 in words is "twenty billion, six hundred twelve million, three hundred thirty-one thousand, three hundred five".