20216590 has 8 divisors (see below), whose sum is σ = 36389880. Its totient is φ = 8086632.

The previous prime is 20216569. The next prime is 20216591. The reversal of 20216590 is 9561202.

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

It is a super-2 number, since 2×20216590² = 817421022456200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216591) by changing a digit.

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, 1010820 + ... + 1010839.

It is an arithmetic number, because the mean of its divisors is an integer number (4548735).

Almost surely, 2^20216590 is an apocalyptic number.

20216590 is a deficient number, since it is larger than the sum of its proper divisors (16173290).

20216590 is a wasteful number, since it uses less digits than its factorization.

20216590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021666.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20216590 is about 4496.2862453363. The cubic root of 20216590 is about 272.4181051776.

Adding to 20216590 its reverse (9561202), we get a palindrome (29777792).

The spelling of 20216590 in words is "twenty million, two hundred sixteen thousand, five hundred ninety".