20189633 has 2 divisors, whose sum is σ = 20189634. Its totient is φ = 20189632.

The previous prime is 20189629. The next prime is 20189639. The reversal of 20189633 is 33698102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19254544 + 935089 = 4388^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 20189633 - 2² = 20189629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20189633.

It is not a weakly prime, because it can be changed into another prime (20189639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10094816 + 10094817.

It is an arithmetic number, because the mean of its divisors is an integer number (10094817).

Almost surely, 2^20189633 is an apocalyptic number.

It is an amenable number.

20189633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20189633 is an equidigital number, since it uses as much as digits as its factorization.

20189633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20189633 is about 4493.2875492227. The cubic root of 20189633 is about 272.2969696600.

The spelling of 20189633 in words is "twenty million, one hundred eighty-nine thousand, six hundred thirty-three".