20550213 has 8 divisors (see below), whose sum is σ = 30444800. Its totient is φ = 13700124.

The previous prime is 20550209. The next prime is 20550217. The reversal of 20550213 is 31205502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20550209) and next prime (20550217).

It is not a de Polignac number, because 20550213 - 2² = 20550209 is a prime.

It is a super-2 number, since 2×20550213² = 844622508690738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550217) 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 in 7 ways as a sum of consecutive naturals, for example, 380533 + ... + 380586.

It is an arithmetic number, because the mean of its divisors is an integer number (3805600).

Almost surely, 2^20550213 is an apocalyptic number.

It is an amenable number.

20550213 is a deficient number, since it is larger than the sum of its proper divisors (9894587).

20550213 is an equidigital number, since it uses as much as digits as its factorization.

20550213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761128 (or 761122 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20550213 is about 4533.2342758785. The cubic root of 20550213 is about 273.9084577069.

Adding to 20550213 its reverse (31205502), we get a palindrome (51755715).

The spelling of 20550213 in words is "twenty million, five hundred fifty thousand, two hundred thirteen".