20312242464 has 144 divisors (see below), whose sum is σ = 57605234400. Its totient is φ = 6263955456.

The previous prime is 20312242463. The next prime is 20312242469. The reversal of 20312242464 is 46424221302.

It is not an unprimeable number, because it can be changed into a prime (20312242463) 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, 1630692 + ... + 1643100.

It is an arithmetic number, because the mean of its divisors is an integer number (400036350).

Almost surely, 2^20312242464 is an apocalyptic number.

20312242464 is a gapful number since it is divisible by the number (24) 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 20312242464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28802617200).

20312242464 is an abundant number, since it is smaller than the sum of its proper divisors (37292991936).

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

20312242464 is a wasteful number, since it uses less digits than its factorization.

20312242464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12515 (or 12490 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 20312242464 its reverse (46424221302), we get a palindrome (66736463766).

The spelling of 20312242464 in words is "twenty billion, three hundred twelve million, two hundred forty-two thousand, four hundred sixty-four".