20400440012 has 12 divisors (see below), whose sum is σ = 35701814736. Its totient is φ = 10199921520.

The previous prime is 20400440009. The next prime is 20400440029. The reversal of 20400440012 is 21004400402.

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 3 ways as a sum of consecutive naturals, for example, 163793 + ... + 260055.

It is an arithmetic number, because the mean of its divisors is an integer number (2975151228).

Almost surely, 2^20400440012 is an apocalyptic number.

It is an amenable number.

20400440012 is a deficient number, since it is larger than the sum of its proper divisors (15301374724).

20400440012 is a wasteful number, since it uses less digits than its factorization.

20400440012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149248 (or 149246 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20400440012 its reverse (21004400402), we get a palindrome (41404840414).

The spelling of 20400440012 in words is "twenty billion, four hundred million, four hundred forty thousand, twelve".