20021223306 has 48 divisors (see below), whose sum is σ = 49320000576. Its totient is φ = 5383857024.

The previous prime is 20021223293. The next prime is 20021223307. The reversal of 20021223306 is 60332212002.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20021223307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1997926 + ... + 2007921.

It is an arithmetic number, because the mean of its divisors is an integer number (1027500012).

Almost surely, 2^20021223306 is an apocalyptic number.

20021223306 is an abundant number, since it is smaller than the sum of its proper divisors (29298777270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021223306 is a wasteful number, since it uses less digits than its factorization.

20021223306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005883 (or 4005876 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20021223306 its reverse (60332212002), we get a palindrome (80353435308).

The spelling of 20021223306 in words is "twenty billion, twenty-one million, two hundred twenty-three thousand, three hundred six".