20189357 has 2 divisors, whose sum is σ = 20189358. Its totient is φ = 20189356.

The previous prime is 20189341. The next prime is 20189359. The reversal of 20189357 is 75398102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 7365796 = 3581^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20189357 - 2⁴ = 20189341 is a prime.

It is a super-2 number, since 2×20189357² = 815220272146898, which contains 22 as substring.

Together with 20189359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20189359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10094678 + 10094679.

It is an arithmetic number, because the mean of its divisors is an integer number (10094679).

Almost surely, 2^20189357 is an apocalyptic number.

It is an amenable number.

20189357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20189357 is an equidigital number, since it uses as much as digits as its factorization.

20189357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20189357 is about 4493.2568366387. The cubic root of 20189357 is about 272.2957288531.

The spelling of 20189357 in words is "twenty million, one hundred eighty-nine thousand, three hundred fifty-seven".