20217043 has 12 divisors (see below), whose sum is σ = 25397680. Its totient is φ = 15752880.

The previous prime is 20217019. The next prime is 20217077. The reversal of 20217043 is 34071202.

It is a de Polignac number, because none of the positive numbers 2^k-20217043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20217043.

It is not an unprimeable number, because it can be changed into a prime (20217343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11088 + ... + 12781.

Almost surely, 2^20217043 is an apocalyptic number.

20217043 is a deficient number, since it is larger than the sum of its proper divisors (5180637).

20217043 is a wasteful number, since it uses less digits than its factorization.

20217043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23898 (or 23887 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20217043 is about 4496.3366199607. The cubic root of 20217043 is about 272.4201398840.

Adding to 20217043 its reverse (34071202), we get a palindrome (54288245).

The spelling of 20217043 in words is "twenty million, two hundred seventeen thousand, forty-three".