20304131224 has 128 divisors (see below), whose sum is σ = 43574630400. Its totient is φ = 8802501120.

The previous prime is 20304131173. The next prime is 20304131227. The reversal of 20304131224 is 42213140302.

It is a super-2 number, since 2×20304131224² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20304131195 and 20304131204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304131227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32177389 + ... + 32178019.

It is an arithmetic number, because the mean of its divisors is an integer number (340426800).

Almost surely, 2^20304131224 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 20304131224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21787315200).

20304131224 is an abundant number, since it is smaller than the sum of its proper divisors (23270499176).

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

20304131224 is a wasteful number, since it uses less digits than its factorization.

20304131224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 949 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20304131224 its reverse (42213140302), we get a palindrome (62517271526).

The spelling of 20304131224 in words is "twenty billion, three hundred four million, one hundred thirty-one thousand, two hundred twenty-four".