20001045 has 16 divisors (see below), whose sum is σ = 33034752. Its totient is φ = 10322880.

The previous prime is 20001031. The next prime is 20001067. The reversal of 20001045 is 54010002.

It is not a de Polignac number, because 20001045 - 2⁴ = 20001029 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21042 + ... + 21971.

It is an arithmetic number, because the mean of its divisors is an integer number (2064672).

Almost surely, 2^20001045 is an apocalyptic number.

It is an amenable number.

20001045 is a deficient number, since it is larger than the sum of its proper divisors (13033707).

20001045 is a wasteful number, since it uses less digits than its factorization.

20001045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43052.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20001045 is about 4472.2527880253. The cubic root of 20001045 is about 271.4464891878.

Adding to 20001045 its reverse (54010002), we get a palindrome (74011047).

The spelling of 20001045 in words is "twenty million, one thousand, forty-five".