20556346 has 8 divisors (see below), whose sum is σ = 31269024. Its totient is φ = 10133340.

The previous prime is 20556307. The next prime is 20556391. The reversal of 20556346 is 64365502.

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

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, 72240 + ... + 72523.

It is an arithmetic number, because the mean of its divisors is an integer number (3908628).

Almost surely, 2^20556346 is an apocalyptic number.

20556346 is a deficient number, since it is larger than the sum of its proper divisors (10712678).

20556346 is a wasteful number, since it uses less digits than its factorization.

20556346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144836.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20556346 is about 4533.9106740208. The cubic root of 20556346 is about 273.9357033853.

It can be divided in two parts, 20556 and 346, that added together give a palindrome (20902).

The spelling of 20556346 in words is "twenty million, five hundred fifty-six thousand, three hundred forty-six".