20750003 has 4 divisors (see below), whose sum is σ = 20940480. Its totient is φ = 20559528.

The previous prime is 20749997. The next prime is 20750011. The reversal of 20750003 is 30005702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30005702 = 2 ⋅15002851.

It is a cyclic number.

It is not a de Polignac number, because 20750003 - 2⁴ = 20749987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20750203) 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, 95075 + ... + 95292.

It is an arithmetic number, because the mean of its divisors is an integer number (5235120).

Almost surely, 2^20750003 is an apocalyptic number.

20750003 is a deficient number, since it is larger than the sum of its proper divisors (190477).

20750003 is a wasteful number, since it uses less digits than its factorization.

20750003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190476.

The product of its (nonzero) digits is 210, while the sum is 17.

The square root of 20750003 is about 4555.2171188649. The cubic root of 20750003 is about 274.7932462478.

Adding to 20750003 its reverse (30005702), we get a palindrome (50755705).

The spelling of 20750003 in words is "twenty million, seven hundred fifty thousand, three".