20550215 has 8 divisors (see below), whose sum is σ = 28183200. Its totient is φ = 14091552.

The previous prime is 20550209. The next prime is 20550217. The reversal of 20550215 is 51205502.

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

It is a cyclic number.

It is not a de Polignac number, because 20550215 - 2⁴ = 20550199 is a prime.

It is a super-2 number, since 2×20550215² = 844622673092450, which contains 22 as substring.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293540 + ... + 293609.

It is an arithmetic number, because the mean of its divisors is an integer number (3522900).

Almost surely, 2^20550215 is an apocalyptic number.

20550215 is a deficient number, since it is larger than the sum of its proper divisors (7632985).

20550215 is an equidigital number, since it uses as much as digits as its factorization.

20550215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587161.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20550215 is about 4533.2344964716. The cubic root of 20550215 is about 273.9084665927.

Adding to 20550215 its reverse (51205502), we get a palindrome (71755717).

The spelling of 20550215 in words is "twenty million, five hundred fifty thousand, two hundred fifteen".