20560398 has 8 divisors (see below), whose sum is σ = 41120808. Its totient is φ = 6853464.

The previous prime is 20560387. The next prime is 20560403. The reversal of 20560398 is 89306502.

It is a happy number.

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

20560398 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1713361 + ... + 1713372.

It is an arithmetic number, because the mean of its divisors is an integer number (5140101).

Almost surely, 2^20560398 is an apocalyptic number.

20560398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20560398 is a wasteful number, since it uses less digits than its factorization.

20560398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426738.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20560398 is about 4534.3575068581. The cubic root of 20560398 is about 273.9537013075.

The spelling of 20560398 in words is "twenty million, five hundred sixty thousand, three hundred ninety-eight".