20450217 has 8 divisors (see below), whose sum is σ = 27847296. Its totient is φ = 13343312.

The previous prime is 20450207. The next prime is 20450239. The reversal of 20450217 is 71205402.

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 20450217 - 2¹⁶ = 20384681 is a prime.

It is a super-2 number, since 2×20450217² = 836422750694178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20450193 and 20450202.

It is not an unprimeable number, because it can be changed into a prime (20450207) 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, 72378 + ... + 72659.

It is an arithmetic number, because the mean of its divisors is an integer number (3480912).

Almost surely, 2^20450217 is an apocalyptic number.

It is an amenable number.

20450217 is a deficient number, since it is larger than the sum of its proper divisors (7397079).

20450217 is a wasteful number, since it uses less digits than its factorization.

20450217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145087.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20450217 is about 4522.1916146930. The cubic root of 20450217 is about 273.4634615698.

Adding to 20450217 its reverse (71205402), we get a palindrome (91655619).

The spelling of 20450217 in words is "twenty million, four hundred fifty thousand, two hundred seventeen".