20253217 has 4 divisors (see below), whose sum is σ = 20268820. Its totient is φ = 20237616.

The previous prime is 20253209. The next prime is 20253241. The reversal of 20253217 is 71235202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9024016 + 11229201 = 3004^2 + 3351^2 .

It is a cyclic number.

It is not a de Polignac number, because 20253217 - 2³ = 20253209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20253017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5658 + ... + 8515.

It is an arithmetic number, because the mean of its divisors is an integer number (5067205).

Almost surely, 2^20253217 is an apocalyptic number.

It is an amenable number.

20253217 is a deficient number, since it is larger than the sum of its proper divisors (15603).

20253217 is a wasteful number, since it uses less digits than its factorization.

20253217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15602.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20253217 is about 4500.3574302493. The cubic root of 20253217 is about 272.5825219308.

Adding to 20253217 its reverse (71235202), we get a palindrome (91488419).

The spelling of 20253217 in words is "twenty million, two hundred fifty-three thousand, two hundred seventeen".