20945904337 has 2 divisors, whose sum is σ = 20945904338. Its totient is φ = 20945904336.

The previous prime is 20945904281. The next prime is 20945904347. The reversal of 20945904337 is 73340954902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14066197201 + 6879707136 = 118601^2 + 82944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20945904337 is a prime.

It is not a weakly prime, because it can be changed into another prime (20945904347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10472952168 + 10472952169.

It is an arithmetic number, because the mean of its divisors is an integer number (10472952169).

Almost surely, 2^20945904337 is an apocalyptic number.

It is an amenable number.

20945904337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945904337 is an equidigital number, since it uses as much as digits as its factorization.

20945904337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 20945904337 in words is "twenty billion, nine hundred forty-five million, nine hundred four thousand, three hundred thirty-seven".