20041018 has 4 divisors (see below), whose sum is σ = 30061530. Its totient is φ = 10020508.

The previous prime is 20041003. The next prime is 20041031. The reversal of 20041018 is 81014002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81014002 = 2 ⋅40507001.

It can be written as a sum of positive squares in only one way, i.e., 19421649 + 619369 = 4407^2 + 787^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20040992 and 20041010.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5010253 + ... + 5010256.

Almost surely, 2^20041018 is an apocalyptic number.

20041018 is a deficient number, since it is larger than the sum of its proper divisors (10020512).

20041018 is a wasteful number, since it uses less digits than its factorization.

20041018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10020511.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 20041018 is about 4476.7195578906. The cubic root of 20041018 is about 271.6272015806.

The spelling of 20041018 in words is "twenty million, forty-one thousand, eighteen".