20302420066 has 4 divisors (see below), whose sum is σ = 30453630102. Its totient is φ = 10151210032.

The previous prime is 20302420049. The next prime is 20302420069. The reversal of 20302420066 is 66002420302.

It is a happy number.

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., 20068972225 + 233447841 = 141665^2 + 15279^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20302420066.

It is not an unprimeable number, because it can be changed into a prime (20302420069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5075605015 + ... + 5075605018.

Almost surely, 2^20302420066 is an apocalyptic number.

20302420066 is a deficient number, since it is larger than the sum of its proper divisors (10151210036).

20302420066 is a wasteful number, since it uses less digits than its factorization.

20302420066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10151210035.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20302420066 its reverse (66002420302), we get a palindrome (86304840368).

The spelling of 20302420066 in words is "twenty billion, three hundred two million, four hundred twenty thousand, sixty-six".