20198715 has 32 divisors (see below), whose sum is σ = 34062336. Its totient is φ = 10200960.

The previous prime is 20198713. The next prime is 20198741. The reversal of 20198715 is 51789102.

It is not a de Polignac number, because 20198715 - 2¹ = 20198713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20198713) 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 31 ways as a sum of consecutive naturals, for example, 43585 + ... + 44045.

It is an arithmetic number, because the mean of its divisors is an integer number (1064448).

Almost surely, 2^20198715 is an apocalyptic number.

20198715 is a deficient number, since it is larger than the sum of its proper divisors (13863621).

20198715 is a wasteful number, since it uses less digits than its factorization.

20198715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 20198715 is about 4494.2980542016. The cubic root of 20198715 is about 272.3377930924.

The spelling of 20198715 in words is "twenty million, one hundred ninety-eight thousand, seven hundred fifteen".