20041645 has 8 divisors (see below), whose sum is σ = 25900056. Its totient is φ = 14799936.

The previous prime is 20041633. The next prime is 20041649. The reversal of 20041645 is 54614002.

It can be written as a sum of positive squares in 4 ways, for example, as 1127844 + 18913801 = 1062^2 + 4349^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20041645 - 2⁵ = 20041613 is a prime.

It is a super-3 number, since 3×20041645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20041649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154102 + ... + 154231.

It is an arithmetic number, because the mean of its divisors is an integer number (3237507).

Almost surely, 2^20041645 is an apocalyptic number.

It is an amenable number.

20041645 is a deficient number, since it is larger than the sum of its proper divisors (5858411).

20041645 is a wasteful number, since it uses less digits than its factorization.

20041645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308351.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20041645 is about 4476.7895862995. The cubic root of 20041645 is about 271.6300342458.

Adding to 20041645 its reverse (54614002), we get a palindrome (74655647).

The spelling of 20041645 in words is "twenty million, forty-one thousand, six hundred forty-five".