20098643 has 4 divisors (see below), whose sum is σ = 20186640. Its totient is φ = 20010648.

The previous prime is 20098613. The next prime is 20098667. The reversal of 20098643 is 34689002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20098643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20098613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43655 + ... + 44112.

It is an arithmetic number, because the mean of its divisors is an integer number (5046660).

Almost surely, 2^20098643 is an apocalyptic number.

20098643 is a deficient number, since it is larger than the sum of its proper divisors (87997).

20098643 is an equidigital number, since it uses as much as digits as its factorization.

20098643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87996.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20098643 is about 4483.1510124019. The cubic root of 20098643 is about 271.8872938115.

The spelling of 20098643 in words is "twenty million, ninety-eight thousand, six hundred forty-three".