20584945 has 4 divisors (see below), whose sum is σ = 24701940. Its totient is φ = 16467952.

The previous prime is 20584903. The next prime is 20584957. The reversal of 20584945 is 54948502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7306209 + 13278736 = 2703^2 + 3644^2 .

It is a cyclic number.

It is not a de Polignac number, because 20584945 - 2¹⁵ = 20552177 is a prime.

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, 2058490 + ... + 2058499.

It is an arithmetic number, because the mean of its divisors is an integer number (6175485).

Almost surely, 2^20584945 is an apocalyptic number.

It is an amenable number.

20584945 is a deficient number, since it is larger than the sum of its proper divisors (4116995).

20584945 is an equidigital number, since it uses as much as digits as its factorization.

20584945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4116994.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 20584945 is about 4537.0634776251. The cubic root of 20584945 is about 274.0626821269.

The spelling of 20584945 in words is "twenty million, five hundred eighty-four thousand, nine hundred forty-five".