20261217 has 4 divisors (see below), whose sum is σ = 27014960. Its totient is φ = 13507476.

The previous prime is 20261191. The next prime is 20261231. The reversal of 20261217 is 71216202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20261217 - 2¹⁰ = 20260193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20261193 and 20261202.

It is not an unprimeable number, because it can be changed into a prime (20261287) 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 3 ways as a sum of consecutive naturals, for example, 3376867 + ... + 3376872.

It is an arithmetic number, because the mean of its divisors is an integer number (6753740).

Almost surely, 2^20261217 is an apocalyptic number.

It is an amenable number.

20261217 is a deficient number, since it is larger than the sum of its proper divisors (6753743).

20261217 is an equidigital number, since it uses as much as digits as its factorization.

20261217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6753742.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20261217 is about 4501.2461607870. The cubic root of 20261217 is about 272.6184071455.

Adding to 20261217 its reverse (71216202), we get a palindrome (91477419).

It can be divided in two parts, 2026 and 1217, that multiplied together give a palindrome (2465642).

The spelling of 20261217 in words is "twenty million, two hundred sixty-one thousand, two hundred seventeen".