20098391 has 2 divisors, whose sum is σ = 20098392. Its totient is φ = 20098390.

The previous prime is 20098381. The next prime is 20098399. The reversal of 20098391 is 19389002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20098391 - 2⁶ = 20098327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20098399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10049195 + 10049196.

It is an arithmetic number, because the mean of its divisors is an integer number (10049196).

Almost surely, 2^20098391 is an apocalyptic number.

20098391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20098391 is an equidigital number, since it uses as much as digits as its factorization.

20098391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20098391 is about 4483.1229070816. The cubic root of 20098391 is about 271.8861574846.

The spelling of 20098391 in words is "twenty million, ninety-eight thousand, three hundred ninety-one".