20269717 has 4 divisors (see below), whose sum is σ = 21828940. Its totient is φ = 18710496.

The previous prime is 20269687. The next prime is 20269721. The reversal of 20269717 is 71796202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11737476 + 8532241 = 3426^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 20269717 - 2¹⁵ = 20236949 is a prime.

It is a super-2 number, since 2×20269717² = 821722854520178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20269517) 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, 779592 + ... + 779617.

It is an arithmetic number, because the mean of its divisors is an integer number (5457235).

Almost surely, 2^20269717 is an apocalyptic number.

It is an amenable number.

20269717 is a deficient number, since it is larger than the sum of its proper divisors (1559223).

20269717 is a wasteful number, since it uses less digits than its factorization.

20269717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559222.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 20269717 is about 4502.1902447587. The cubic root of 20269717 is about 272.6565248375.

The spelling of 20269717 in words is "twenty million, two hundred sixty-nine thousand, seven hundred seventeen".