20683217 has 4 divisors (see below), whose sum is σ = 21033840. Its totient is φ = 20332596.

The previous prime is 20683211. The next prime is 20683241. The reversal of 20683217 is 71238602.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 20683217 - 2¹² = 20679121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20683217.

It is not an unprimeable number, because it can be changed into a prime (20683211) 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, 175223 + ... + 175340.

It is an arithmetic number, because the mean of its divisors is an integer number (5258460).

Almost surely, 2^20683217 is an apocalyptic number.

It is an amenable number.

20683217 is a deficient number, since it is larger than the sum of its proper divisors (350623).

20683217 is an equidigital number, since it uses as much as digits as its factorization.

20683217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350622.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20683217 is about 4547.8804953517. The cubic root of 20683217 is about 274.4981126896.

The spelling of 20683217 in words is "twenty million, six hundred eighty-three thousand, two hundred seventeen".