20556361 has 8 divisors (see below), whose sum is σ = 23776704. Its totient is φ = 17406960.

The previous prime is 20556307. The next prime is 20556391. The reversal of 20556361 is 16365502.

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

It is a cyclic number.

It is not a de Polignac number, because 20556361 - 2¹³ = 20548169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20556301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17110 + ... + 18271.

It is an arithmetic number, because the mean of its divisors is an integer number (2972088).

Almost surely, 2^20556361 is an apocalyptic number.

It is an amenable number.

20556361 is a deficient number, since it is larger than the sum of its proper divisors (3220343).

20556361 is an equidigital number, since it uses as much as digits as its factorization.

20556361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35471.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20556361 is about 4533.9123282216. The cubic root of 20556361 is about 273.9357700158.

The spelling of 20556361 in words is "twenty million, five hundred fifty-six thousand, three hundred sixty-one".