20012221064 has 64 divisors (see below), whose sum is σ = 42741095040. Its totient is φ = 8695413760.

The previous prime is 20012221063. The next prime is 20012221069. The reversal of 20012221064 is 46012221002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20012221063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5861822 + ... + 5865234.

It is an arithmetic number, because the mean of its divisors is an integer number (667829610).

Almost surely, 2^20012221064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012221064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21370547520).

20012221064 is an abundant number, since it is smaller than the sum of its proper divisors (22728873976).

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

20012221064 is a wasteful number, since it uses less digits than its factorization.

20012221064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6350 (or 6346 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20012221064 its reverse (46012221002), we get a palindrome (66024442066).

The spelling of 20012221064 in words is "twenty billion, twelve million, two hundred twenty-one thousand, sixty-four".