20257743 has 16 divisors (see below), whose sum is σ = 31017600. Its totient is φ = 11630880.

The previous prime is 20257729. The next prime is 20257751. The reversal of 20257743 is 34775202.

It is not a de Polignac number, because 20257743 - 2⁵ = 20257711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20257743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20257703) 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, 15528 + ... + 16781.

It is an arithmetic number, because the mean of its divisors is an integer number (1938600).

Almost surely, 2^20257743 is an apocalyptic number.

20257743 is a deficient number, since it is larger than the sum of its proper divisors (10759857).

20257743 is a wasteful number, since it uses less digits than its factorization.

20257743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32342.

The product of its (nonzero) digits is 11760, while the sum is 30.

The square root of 20257743 is about 4500.8602511076. The cubic root of 20257743 is about 272.6028251515.

The spelling of 20257743 in words is "twenty million, two hundred fifty-seven thousand, seven hundred forty-three".