20495717 has 4 divisors (see below), whose sum is σ = 22358976. Its totient is φ = 18632460.

The previous prime is 20495701. The next prime is 20495719. The reversal of 20495717 is 71759402.

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 not a de Polignac number, because 20495717 - 2⁴ = 20495701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20495719) 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, 931613 + ... + 931634.

It is an arithmetic number, because the mean of its divisors is an integer number (5589744).

Almost surely, 2^20495717 is an apocalyptic number.

It is an amenable number.

20495717 is a deficient number, since it is larger than the sum of its proper divisors (1863259).

20495717 is a wasteful number, since it uses less digits than its factorization.

20495717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863258.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 20495717 is about 4527.2195661355. The cubic root of 20495717 is about 273.6661223532. Note that the first 3 decimals are identical.

It can be divided in two parts, 20495 and 717, that added together give a palindrome (21212).

The spelling of 20495717 in words is "twenty million, four hundred ninety-five thousand, seven hundred seventeen".