20165998 has 8 divisors (see below), whose sum is σ = 30274200. Its totient is φ = 10074600.

The previous prime is 20165987. The next prime is 20166001. The reversal of 20165998 is 89956102.

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 20165998.

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, 573 + ... + 6376.

It is an arithmetic number, because the mean of its divisors is an integer number (3784275).

Almost surely, 2^20165998 is an apocalyptic number.

20165998 is a deficient number, since it is larger than the sum of its proper divisors (10108202).

20165998 is a wasteful number, since it uses less digits than its factorization.

20165998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8402.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 20165998 is about 4490.6567448426. The cubic root of 20165998 is about 272.1906733272.

The spelling of 20165998 in words is "twenty million, one hundred sixty-five thousand, nine hundred ninety-eight".