20743471 has 4 divisors (see below), whose sum is σ = 23706832. Its totient is φ = 17780112.

The previous prime is 20743469. The next prime is 20743483. The reversal of 20743471 is 17434702.

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

It is not a de Polignac number, because 20743471 - 2¹ = 20743469 is a prime.

It is a super-3 number, since 3×20743471³ (a number of 23 digits) contains 333 as substring.

It is the 4555-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20743271) by changing a digit.

It is a nontrivial repunit in base 4554.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1481670 + ... + 1481683.

It is an arithmetic number, because the mean of its divisors is an integer number (5926708).

Almost surely, 2^20743471 is an apocalyptic number.

20743471 is a deficient number, since it is larger than the sum of its proper divisors (2963361).

20743471 is an equidigital number, since it uses as much as digits as its factorization.

20743471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963360.

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

The square root of 20743471 is about 4554.5000823362. The cubic root of 20743471 is about 274.7644086959.

The spelling of 20743471 in words is "twenty million, seven hundred forty-three thousand, four hundred seventy-one".