20411145 has 24 divisors (see below), whose sum is σ = 35497800. Its totient is φ = 10849536.

The previous prime is 20411141. The next prime is 20411147. The reversal of 20411145 is 54111402.

It can be written as a sum of positive squares in 4 ways, for example, as 1121481 + 19289664 = 1059^2 + 4392^2 .

It is not a de Polignac number, because 20411145 - 2² = 20411141 is a prime.

It is a super-2 number, since 2×20411145² = 833229680422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20411141) 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 23 ways as a sum of consecutive naturals, for example, 17851 + ... + 18959.

It is an arithmetic number, because the mean of its divisors is an integer number (1479075).

Almost surely, 2^20411145 is an apocalyptic number.

It is an amenable number.

20411145 is a deficient number, since it is larger than the sum of its proper divisors (15086655).

20411145 is a wasteful number, since it uses less digits than its factorization.

20411145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20411145 is about 4517.8695200282. The cubic root of 20411145 is about 273.2891915961.

Adding to 20411145 its reverse (54111402), we get a palindrome (74522547).

The spelling of 20411145 in words is "twenty million, four hundred eleven thousand, one hundred forty-five".