20312244420 has 192 divisors, whose sum is σ = 62183116800. Its totient is φ = 4924288512.

The previous prime is 20312244401. The next prime is 20312244427. The reversal of 20312244420 is 2444221302.

It is a super-2 number, since 2×20312244420² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20312244427) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16607929 + ... + 16609151.

It is an arithmetic number, because the mean of its divisors is an integer number (323870400).

Almost surely, 2^20312244420 is an apocalyptic number.

20312244420 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 20312244420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31091558400).

20312244420 is an abundant number, since it is smaller than the sum of its proper divisors (41870872380).

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

20312244420 is a wasteful number, since it uses less digits than its factorization.

20312244420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20312244420 its reverse (2444221302), we get a palindrome (22756465722).

The spelling of 20312244420 in words is "twenty billion, three hundred twelve million, two hundred forty-four thousand, four hundred twenty".