20098509 has 8 divisors (see below), whose sum is σ = 27662592. Its totient is φ = 12966720.

The previous prime is 20098499. The next prime is 20098517. The reversal of 20098509 is 90589002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20098509 - 2⁷ = 20098381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20098509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20098009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107964 + ... + 108149.

It is an arithmetic number, because the mean of its divisors is an integer number (3457824).

Almost surely, 2^20098509 is an apocalyptic number.

It is an amenable number.

20098509 is a deficient number, since it is larger than the sum of its proper divisors (7564083).

20098509 is a wasteful number, since it uses less digits than its factorization.

20098509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216147.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 20098509 is about 4483.1360675313. The cubic root of 20098509 is about 271.8866895753.

The spelling of 20098509 in words is "twenty million, ninety-eight thousand, five hundred nine".