20344187 has 2 divisors, whose sum is σ = 20344188. Its totient is φ = 20344186.

The previous prime is 20344157. The next prime is 20344199. The reversal of 20344187 is 78144302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20344187 - 2⁶ = 20344123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20344147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172093 + 10172094.

It is an arithmetic number, because the mean of its divisors is an integer number (10172094).

Almost surely, 2^20344187 is an apocalyptic number.

20344187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344187 is an equidigital number, since it uses as much as digits as its factorization.

20344187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20344187 is about 4510.4530814542. The cubic root of 20344187 is about 272.9900258894.

Adding to 20344187 its reverse (78144302), we get a palindrome (98488489).

The spelling of 20344187 in words is "twenty million, three hundred forty-four thousand, one hundred eighty-seven".