20424304220 has 72 divisors (see below), whose sum is σ = 47930342544. Its totient is φ = 7284413952.

The previous prime is 20424304207. The next prime is 20424304223. The reversal of 20424304220 is 2240342402.

It is a super-2 number, since 2×20424304220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424304223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39539 + ... + 205941.

It is an arithmetic number, because the mean of its divisors is an integer number (665699202).

Almost surely, 2^20424304220 is an apocalyptic number.

20424304220 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 20424304220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23965171272).

20424304220 is an abundant number, since it is smaller than the sum of its proper divisors (27506038324).

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

20424304220 is a wasteful number, since it uses less digits than its factorization.

20424304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166467 (or 166446 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 23.

Adding to 20424304220 its reverse (2240342402), we get a palindrome (22664646622).

The spelling of 20424304220 in words is "twenty billion, four hundred twenty-four million, three hundred four thousand, two hundred twenty".