20420044066 has 4 divisors (see below), whose sum is σ = 30630066102. Its totient is φ = 10210022032.

The previous prime is 20420044009. The next prime is 20420044067. The reversal of 20420044066 is 66044002402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18151903441 + 2268140625 = 134729^2 + 47625^2 .

It is not an unprimeable number, because it can be changed into a prime (20420044067) by changing a digit.

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, 5105011015 + ... + 5105011018.

Almost surely, 2^20420044066 is an apocalyptic number.

20420044066 is a deficient number, since it is larger than the sum of its proper divisors (10210022036).

20420044066 is a wasteful number, since it uses less digits than its factorization.

20420044066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210022035.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 20420044066 its reverse (66044002402), we get a palindrome (86464046468).

The spelling of 20420044066 in words is "twenty billion, four hundred twenty million, forty-four thousand, sixty-six".