20447117 has 4 divisors (see below), whose sum is σ = 21152220. Its totient is φ = 19742016.

The previous prime is 20447111. The next prime is 20447131. The reversal of 20447117 is 71174402.

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 12752041 + 7695076 = 3571^2 + 2774^2 .

It is a cyclic number.

It is not a de Polignac number, because 20447117 - 2⁴ = 20447101 is a prime.

It is a super-2 number, since 2×20447117² = 836169187223378, 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 (20447111) 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, 352508 + ... + 352565.

It is an arithmetic number, because the mean of its divisors is an integer number (5288055).

Almost surely, 2^20447117 is an apocalyptic number.

It is an amenable number.

20447117 is a deficient number, since it is larger than the sum of its proper divisors (705103).

20447117 is an equidigital number, since it uses as much as digits as its factorization.

20447117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705102.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20447117 is about 4521.8488475401. The cubic root of 20447117 is about 273.4496429786.

The spelling of 20447117 in words is "twenty million, four hundred forty-seven thousand, one hundred seventeen".