20355864337 has 2 divisors, whose sum is σ = 20355864338. Its totient is φ = 20355864336.

The previous prime is 20355864307. The next prime is 20355864407. The reversal of 20355864337 is 73346855302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12075592321 + 8280272016 = 109889^2 + 90996^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355864337 - 2²⁷ = 20221646609 is a prime.

It is a super-2 number, since 2×20355864337² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20355864307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177932168 + 10177932169.

It is an arithmetic number, because the mean of its divisors is an integer number (10177932169).

Almost surely, 2^20355864337 is an apocalyptic number.

It is an amenable number.

20355864337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355864337 is an equidigital number, since it uses as much as digits as its factorization.

20355864337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 20355864337 in words is "twenty billion, three hundred fifty-five million, eight hundred sixty-four thousand, three hundred thirty-seven".