20194259 has 2 divisors, whose sum is σ = 20194260. Its totient is φ = 20194258.

The previous prime is 20194241. The next prime is 20194271. The reversal of 20194259 is 95249102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20194259 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20194159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10097129 + 10097130.

It is an arithmetic number, because the mean of its divisors is an integer number (10097130).

Almost surely, 2^20194259 is an apocalyptic number.

20194259 is a deficient number, since it is larger than the sum of its proper divisors (1).

20194259 is an equidigital number, since it uses as much as digits as its factorization.

20194259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20194259 is about 4493.8022875957. The cubic root of 20194259 is about 272.3177649792.

The spelling of 20194259 in words is "twenty million, one hundred ninety-four thousand, two hundred fifty-nine".