20198741 has 2 divisors, whose sum is σ = 20198742. Its totient is φ = 20198740.

The previous prime is 20198713. The next prime is 20198743. The reversal of 20198741 is 14789102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 1311025 = 4346^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 20198741 - 2²² = 16004437 is a prime.

Together with 20198743, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20198698 and 20198707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20198743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099370 + 10099371.

It is an arithmetic number, because the mean of its divisors is an integer number (10099371).

Almost surely, 2^20198741 is an apocalyptic number.

It is an amenable number.

20198741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20198741 is an equidigital number, since it uses as much as digits as its factorization.

20198741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 20198741 is about 4494.3009467547. The cubic root of 20198741 is about 272.3379099444.

The spelling of 20198741 in words is "twenty million, one hundred ninety-eight thousand, seven hundred forty-one".