20443313437 has 2 divisors, whose sum is σ = 20443313438. Its totient is φ = 20443313436.

The previous prime is 20443313381. The next prime is 20443313459. The reversal of 20443313437 is 73431334402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20206338201 + 236975236 = 142149^2 + 15394^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443313437 - 2⁷ = 20443313309 is a prime.

It is a super-3 number, since 3×20443313437³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443313837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221656718 + 10221656719.

It is an arithmetic number, because the mean of its divisors is an integer number (10221656719).

Almost surely, 2^20443313437 is an apocalyptic number.

It is an amenable number.

20443313437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443313437 is an equidigital number, since it uses as much as digits as its factorization.

20443313437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 34.

Adding to 20443313437 its reverse (73431334402), we get a palindrome (93874647839).

The spelling of 20443313437 in words is "twenty billion, four hundred forty-three million, three hundred thirteen thousand, four hundred thirty-seven".