20743001 has 4 divisors (see below), whose sum is σ = 20759604. Its totient is φ = 20726400.

The previous prime is 20742983. The next prime is 20743013. The reversal of 20743001 is 10034702.

It is a happy number.

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 9859600 + 10883401 = 3140^2 + 3299^2 .

It is a cyclic number.

It is not a de Polignac number, because 20743001 - 2¹⁴ = 20726617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20743031) 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, 6260 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (5189901).

Almost surely, 2^20743001 is an apocalyptic number.

It is an amenable number.

20743001 is a deficient number, since it is larger than the sum of its proper divisors (16603).

20743001 is a wasteful number, since it uses less digits than its factorization.

20743001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16602.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20743001 is about 4554.4484847235. The cubic root of 20743001 is about 274.7623335008.

Adding to 20743001 its reverse (10034702), we get a palindrome (30777703).

The spelling of 20743001 in words is "twenty million, seven hundred forty-three thousand, one".