20424221000 has 128 divisors (see below), whose sum is σ = 50594544000. Its totient is φ = 7695648000.

The previous prime is 20424220967. The next prime is 20424221011. The reversal of 20424221000 is 12242402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20424221000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3436031 + ... + 3441969.

It is an arithmetic number, because the mean of its divisors is an integer number (395269875).

Almost surely, 2^20424221000 is an apocalyptic number.

20424221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20424221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25297272000).

20424221000 is an abundant number, since it is smaller than the sum of its proper divisors (30170323000).

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

20424221000 is a wasteful number, since it uses less digits than its factorization.

20424221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6160 (or 6146 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20424221000 its reverse (12242402), we get a palindrome (20436463402).

The spelling of 20424221000 in words is "twenty billion, four hundred twenty-four million, two hundred twenty-one thousand".