20028003 has 4 divisors (see below), whose sum is σ = 26704008. Its totient is φ = 13352000.

The previous prime is 20027999. The next prime is 20028013. The reversal of 20028003 is 30082002.

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 20028003 - 2² = 20027999 is a prime.

It is a super-2 number, since 2×20028003² = 802241808336018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20028013) 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, 3337998 + ... + 3338003.

It is an arithmetic number, because the mean of its divisors is an integer number (6676002).

Almost surely, 2^20028003 is an apocalyptic number.

20028003 is a deficient number, since it is larger than the sum of its proper divisors (6676005).

20028003 is an equidigital number, since it uses as much as digits as its factorization.

20028003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6676004.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20028003 is about 4475.2656904367. The cubic root of 20028003 is about 271.5683889730.

It can be divided in two parts, 200 and 28003, that added together give a triangular number (28203 = T₂₃₇).

The spelling of 20028003 in words is "twenty million, twenty-eight thousand, three".