20559998 has 8 divisors (see below), whose sum is σ = 30868992. Its totient is φ = 10270336.

The previous prime is 20559991. The next prime is 20560003. The reversal of 20559998 is 89995502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20559991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1790 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (3858624).

Almost surely, 2^20559998 is an apocalyptic number.

20559998 is a deficient number, since it is larger than the sum of its proper divisors (10308994).

20559998 is a wasteful number, since it uses less digits than its factorization.

20559998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9666.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 20559998 is about 4534.3133989613. The cubic root of 20559998 is about 273.9519247175.

The spelling of 20559998 in words is "twenty million, five hundred fifty-nine thousand, nine hundred ninety-eight".