20028007 has 4 divisors (see below), whose sum is σ = 20205360. Its totient is φ = 19850656.

The previous prime is 20027999. The next prime is 20028013. The reversal of 20028007 is 70082002.

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 20028007 - 2³ = 20027999 is a prime.

It is a super-2 number, since 2×20028007² = 802242128784098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88507 + ... + 88732.

It is an arithmetic number, because the mean of its divisors is an integer number (5051340).

Almost surely, 2^20028007 is an apocalyptic number.

20028007 is a deficient number, since it is larger than the sum of its proper divisors (177353).

20028007 is a wasteful number, since it uses less digits than its factorization.

20028007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177352.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20028007 is about 4475.2661373375. The cubic root of 20028007 is about 271.5684070522.

The spelling of 20028007 in words is "twenty million, twenty-eight thousand, seven".