20417998 has 8 divisors (see below), whose sum is σ = 30732408. Its totient is φ = 10173864.

The previous prime is 20417987. The next prime is 20418011. The reversal of 20417998 is 89971402.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20417998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16836 + ... + 18007.

It is an arithmetic number, because the mean of its divisors is an integer number (3841551).

Almost surely, 2^20417998 is an apocalyptic number.

20417998 is a deficient number, since it is larger than the sum of its proper divisors (10314410).

20417998 is a wasteful number, since it uses less digits than its factorization.

20417998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35138.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 20417998 is about 4518.6278890831. The cubic root of 20417998 is about 273.3197736019.

The spelling of 20417998 in words is "twenty million, four hundred seventeen thousand, nine hundred ninety-eight".