20447317 has 16 divisors (see below), whose sum is σ = 23063040. Its totient is φ = 17967600.

The previous prime is 20447293. The next prime is 20447341. The reversal of 20447317 is 71374402.

It is an interprime number because it is at equal distance from previous prime (20447293) and next prime (20447341).

It is a cyclic number.

It is not a de Polignac number, because 20447317 - 2¹⁵ = 20414549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65592 + ... + 65902.

It is an arithmetic number, because the mean of its divisors is an integer number (1441440).

Almost surely, 2^20447317 is an apocalyptic number.

It is an amenable number.

20447317 is a deficient number, since it is larger than the sum of its proper divisors (2615723).

20447317 is a wasteful number, since it uses less digits than its factorization.

20447317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20447317 is about 4521.8709623341. The cubic root of 20447317 is about 273.4505345427.

The spelling of 20447317 in words is "twenty million, four hundred forty-seven thousand, three hundred seventeen".