20216582 has 4 divisors (see below), whose sum is σ = 30324876. Its totient is φ = 10108290.

The previous prime is 20216569. The next prime is 20216591. The reversal of 20216582 is 28561202.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5054144 + ... + 5054147.

It is an arithmetic number, because the mean of its divisors is an integer number (7581219).

Almost surely, 2^20216582 is an apocalyptic number.

20216582 is a deficient number, since it is larger than the sum of its proper divisors (10108294).

20216582 is a wasteful number, since it uses less digits than its factorization.

20216582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10108293.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20216582 is about 4496.2853557131. The cubic root of 20216582 is about 272.4180692443.

Adding to 20216582 its reverse (28561202), we get a palindrome (48777784).

The spelling of 20216582 in words is "twenty million, two hundred sixteen thousand, five hundred eighty-two".