20023117 has 4 divisors (see below), whose sum is σ = 20669056. Its totient is φ = 19377180.

The previous prime is 20023063. The next prime is 20023121. The reversal of 20023117 is 71132002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71132002 = 2 ⋅35566001.

It is a cyclic number.

It is not a de Polignac number, because 20023117 - 2¹¹ = 20021069 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 20023117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023147) 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, 322923 + ... + 322984.

It is an arithmetic number, because the mean of its divisors is an integer number (5167264).

Almost surely, 2^20023117 is an apocalyptic number.

It is an amenable number.

20023117 is a deficient number, since it is larger than the sum of its proper divisors (645939).

20023117 is an equidigital number, since it uses as much as digits as its factorization.

20023117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645938.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20023117 is about 4474.7197677620. The cubic root of 20023117 is about 271.5463033784.

Adding to 20023117 its reverse (71132002), we get a palindrome (91155119).

The spelling of 20023117 in words is "twenty million, twenty-three thousand, one hundred seventeen".