20305233681 has 16 divisors (see below), whose sum is σ = 28257828480. Its totient is φ = 12945025280.

The previous prime is 20305233679. The next prime is 20305233719. The reversal of 20305233681 is 18633250302.

It is a cyclic number.

It is not a de Polignac number, because 20305233681 - 2¹ = 20305233679 is a prime.

It is a super-2 number, since 2×20305233681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20305232681) 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, 257935 + ... + 327323.

It is an arithmetic number, because the mean of its divisors is an integer number (1766114280).

Almost surely, 2^20305233681 is an apocalyptic number.

It is an amenable number.

20305233681 is a deficient number, since it is larger than the sum of its proper divisors (7952594799).

20305233681 is a wasteful number, since it uses less digits than its factorization.

20305233681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73656.

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 20305233681 its reverse (18633250302), we get a palindrome (38938483983).

The spelling of 20305233681 in words is "twenty billion, three hundred five million, two hundred thirty-three thousand, six hundred eighty-one".