20440066 has 4 divisors (see below), whose sum is σ = 30660102. Its totient is φ = 10220032.

The previous prime is 20440039. The next prime is 20440109. The reversal of 20440066 is 66004402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66004402 = 2 ⋅33002201.

It can be written as a sum of positive squares in only one way, i.e., 20439441 + 625 = 4521^2 + 25^2 .

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 as a sum of consecutive naturals, namely, 5110015 + ... + 5110018.

Almost surely, 2^20440066 is an apocalyptic number.

20440066 is a deficient number, since it is larger than the sum of its proper divisors (10220036).

20440066 is a wasteful number, since it uses less digits than its factorization.

20440066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10220035.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20440066 is about 4521.0691213473. The cubic root of 20440066 is about 273.4182071678.

Adding to 20440066 its reverse (66004402), we get a palindrome (86444468).

The spelling of 20440066 in words is "twenty million, four hundred forty thousand, sixty-six".