20717423 has 8 divisors (see below), whose sum is σ = 21437136. Its totient is φ = 20008000.

The previous prime is 20717419. The next prime is 20717449. The reversal of 20717423 is 32471702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20717423 - 2² = 20717419 is a prime.

It is a super-4 number, since 4×20717423⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20717392 and 20717401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1640 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (2679642).

Almost surely, 2^20717423 is an apocalyptic number.

20717423 is a deficient number, since it is larger than the sum of its proper divisors (719713).

20717423 is a wasteful number, since it uses less digits than its factorization.

20717423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20717423 is about 4551.6395946955. The cubic root of 20717423 is about 274.6493514302.

The spelling of 20717423 in words is "twenty million, seven hundred seventeen thousand, four hundred twenty-three".