20715743 has 4 divisors (see below), whose sum is σ = 20729280. Its totient is φ = 20702208.

The previous prime is 20715731. The next prime is 20715763. The reversal of 20715743 is 34751702.

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

It is a cyclic number.

It is not a de Polignac number, because 20715743 - 2¹⁸ = 20453599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20715703) 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, 4130 + ... + 7647.

It is an arithmetic number, because the mean of its divisors is an integer number (5182320).

Almost surely, 2^20715743 is an apocalyptic number.

20715743 is a deficient number, since it is larger than the sum of its proper divisors (13537).

20715743 is a wasteful number, since it uses less digits than its factorization.

20715743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13536.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20715743 is about 4551.4550420717. The cubic root of 20715743 is about 274.6419273507.

The spelling of 20715743 in words is "twenty million, seven hundred fifteen thousand, seven hundred forty-three".