20187633443 has 2 divisors, whose sum is σ = 20187633444. Its totient is φ = 20187633442.

The previous prime is 20187633419. The next prime is 20187633451. The reversal of 20187633443 is 34433678102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20187633443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20187633443.

It is not a weakly prime, because it can be changed into another prime (20187633463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10093816721 + 10093816722.

It is an arithmetic number, because the mean of its divisors is an integer number (10093816722).

Almost surely, 2^20187633443 is an apocalyptic number.

20187633443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20187633443 is an equidigital number, since it uses as much as digits as its factorization.

20187633443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 20187633443 in words is "twenty billion, one hundred eighty-seven million, six hundred thirty-three thousand, four hundred forty-three".