20120323134440 has 32 divisors (see below), whose sum is σ = 45473734817280. Its totient is φ = 8012038984512.

The previous prime is 20120323134347. The next prime is 20120323134449. The reversal of 20120323134440 is 4443132302102.

It is a super-2 number, since 2×20120323134440² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20120323134449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1127811884 + ... + 1127829723.

It is an arithmetic number, because the mean of its divisors is an integer number (1421054213040).

Almost surely, 2^{20120323134440} is an apocalyptic number.

20120323134440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120323134440 is an abundant number, since it is smaller than the sum of its proper divisors (25353411682840).

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

20120323134440 is a wasteful number, since it uses less digits than its factorization.

20120323134440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255641841 (or 2255641837 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 20120323134440 its reverse (4443132302102), we get a palindrome (24563455436542).

The spelling of 20120323134440 in words is "twenty trillion, one hundred twenty billion, three hundred twenty-three million, one hundred thirty-four thousand, four hundred forty".