20217073 has 4 divisors (see below), whose sum is σ = 20294208. Its totient is φ = 20139940.

The previous prime is 20217019. The next prime is 20217077. The reversal of 20217073 is 37071202.

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 20217073 - 2²¹ = 18119921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20217077) 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, 38173 + ... + 38698.

It is an arithmetic number, because the mean of its divisors is an integer number (5073552).

Almost surely, 2^20217073 is an apocalyptic number.

It is an amenable number.

20217073 is a deficient number, since it is larger than the sum of its proper divisors (77135).

20217073 is an equidigital number, since it uses as much as digits as its factorization.

20217073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77134.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 20217073 is about 4496.3399560087. The cubic root of 20217073 is about 272.4202746317.

Adding to 20217073 its reverse (37071202), we get a palindrome (57288275).

The spelling of 20217073 in words is "twenty million, two hundred seventeen thousand, seventy-three".