20443646357 has 2 divisors, whose sum is σ = 20443646358. Its totient is φ = 20443646356.

The previous prime is 20443646287. The next prime is 20443646369. The reversal of 20443646357 is 75364634402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11403249796 + 9040396561 = 106786^2 + 95081^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443646357 - 2²⁸ = 20175210901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443646557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221823178 + 10221823179.

It is an arithmetic number, because the mean of its divisors is an integer number (10221823179).

Almost surely, 2^20443646357 is an apocalyptic number.

It is an amenable number.

20443646357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443646357 is an equidigital number, since it uses as much as digits as its factorization.

20443646357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 44.

The spelling of 20443646357 in words is "twenty billion, four hundred forty-three million, six hundred forty-six thousand, three hundred fifty-seven".