20743087 has 4 divisors (see below), whose sum is σ = 21134520. Its totient is φ = 20351656.

The previous prime is 20743081. The next prime is 20743097. The reversal of 20743087 is 78034702.

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 20743087 - 2¹⁹ = 20218799 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 (20743081) 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, 195637 + ... + 195742.

It is an arithmetic number, because the mean of its divisors is an integer number (5283630).

Almost surely, 2^20743087 is an apocalyptic number.

20743087 is a deficient number, since it is larger than the sum of its proper divisors (391433).

20743087 is an equidigital number, since it uses as much as digits as its factorization.

20743087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391432.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20743087 is about 4554.4579260325. The cubic root of 20743087 is about 274.7627132197.

Adding to 20743087 its reverse (78034702), we get a palindrome (98777789).

The spelling of 20743087 in words is "twenty million, seven hundred forty-three thousand, eighty-seven".