20120440505 has 32 divisors (see below), whose sum is σ = 26512358400. Its totient is φ = 14537318400.

The previous prime is 20120440499. The next prime is 20120440517. The reversal of 20120440505 is 50504402102.

It is a happy number.

It is not a de Polignac number, because 20120440505 - 2⁶ = 20120440441 is a prime.

It is a super-2 number, since 2×20120440505² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6347561 + ... + 6350729.

It is an arithmetic number, because the mean of its divisors is an integer number (828511200).

Almost surely, 2^20120440505 is an apocalyptic number.

It is an amenable number.

20120440505 is a deficient number, since it is larger than the sum of its proper divisors (6391917895).

20120440505 is a wasteful number, since it uses less digits than its factorization.

20120440505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905.

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 20120440505 its reverse (50504402102), we get a palindrome (70624842607).

The spelling of 20120440505 in words is "twenty billion, one hundred twenty million, four hundred forty thousand, five hundred five".