20005582 has 4 divisors (see below), whose sum is σ = 30008376. Its totient is φ = 10002790.

The previous prime is 20005541. The next prime is 20005589. The reversal of 20005582 is 28550002.

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

It is a super-2 number, since 2×20005582² = 800446622317448, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001394 + ... + 5001397.

It is an arithmetic number, because the mean of its divisors is an integer number (7502094).

Almost surely, 2^20005582 is an apocalyptic number.

20005582 is a deficient number, since it is larger than the sum of its proper divisors (10002794).

20005582 is a wasteful number, since it uses less digits than its factorization.

20005582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10002793.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 20005582 is about 4472.7599980325. The cubic root of 20005582 is about 271.4670124424.

Adding to 20005582 its reverse (28550002), we get a palindrome (48555584).

The spelling of 20005582 in words is "twenty million, five thousand, five hundred eighty-two".