20133689 has 2 divisors, whose sum is σ = 20133690. Its totient is φ = 20133688.

The previous prime is 20133679. The next prime is 20133713. The reversal of 20133689 is 98633102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16875664 + 3258025 = 4108^2 + 1805^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133689 - 2²⁰ = 19085113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_1278563 and since 20133689 and 1278563 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20133629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066844 + 10066845.

It is an arithmetic number, because the mean of its divisors is an integer number (10066845).

Almost surely, 2^20133689 is an apocalyptic number.

It is an amenable number.

20133689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133689 is an equidigital number, since it uses as much as digits as its factorization.

20133689 is an evil number, because the sum of its binary digits is even.

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

The square root of 20133689 is about 4487.0579448008. The cubic root of 20133689 is about 272.0452319890.

The spelling of 20133689 in words is "twenty million, one hundred thirty-three thousand, six hundred eighty-nine".