20002145 has 8 divisors (see below), whose sum is σ = 24063720. Its totient is φ = 15960960.

The previous prime is 20002133. The next prime is 20002159. The reversal of 20002145 is 54120002.

It can be written as a sum of positive squares in 4 ways, for example, as 5125696 + 14876449 = 2264^2 + 3857^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20002145 - 2¹⁸ = 19740001 is a prime.

20002145 is a modest number, since divided by 2145 gives 20 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2846 + ... + 6935.

It is an arithmetic number, because the mean of its divisors is an integer number (3007965).

Almost surely, 2^20002145 is an apocalyptic number.

It is an amenable number.

20002145 is a deficient number, since it is larger than the sum of its proper divisors (4061575).

20002145 is an equidigital number, since it uses as much as digits as its factorization.

20002145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10195.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20002145 is about 4472.3757668604. The cubic root of 20002145 is about 271.4514653556.

Adding to 20002145 its reverse (54120002), we get a palindrome (74122147).

The spelling of 20002145 in words is "twenty million, two thousand, one hundred forty-five".