20249017 has 4 divisors (see below), whose sum is σ = 20362320. Its totient is φ = 20135716.

The previous prime is 20248999. The next prime is 20249077. The reversal of 20249017 is 71094202.

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: 71094202 = 2 ⋅35547101.

It is a cyclic number.

It is not a de Polignac number, because 20249017 - 2¹⁹ = 19724729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20248982 and 20249000.

It is not an unprimeable number, because it can be changed into a prime (20249077) 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, 56383 + ... + 56740.

It is an arithmetic number, because the mean of its divisors is an integer number (5090580).

Almost surely, 2^20249017 is an apocalyptic number.

It is an amenable number.

20249017 is a deficient number, since it is larger than the sum of its proper divisors (113303).

20249017 is a wasteful number, since it uses less digits than its factorization.

20249017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113302.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20249017 is about 4499.8907764522. The cubic root of 20249017 is about 272.5636784101.

The spelling of 20249017 in words is "twenty million, two hundred forty-nine thousand, seventeen".