20198658 has 16 divisors (see below), whose sum is σ = 40557600. Its totient is φ = 6706176.

The previous prime is 20198657. The next prime is 20198713. The reversal of 20198658 is 85689102.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20198657) 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, 5008 + ... + 8091.

It is an arithmetic number, because the mean of its divisors is an integer number (2534850).

Almost surely, 2^20198658 is an apocalyptic number.

20198658 is an abundant number, since it is smaller than the sum of its proper divisors (20358942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20198658 is a wasteful number, since it uses less digits than its factorization.

20198658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13361.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 20198658 is about 4494.2917128286. The cubic root of 20198658 is about 272.3375369166.

The spelling of 20198658 in words is "twenty million, one hundred ninety-eight thousand, six hundred fifty-eight".