20400244012 has 6 divisors (see below), whose sum is σ = 35700427028. Its totient is φ = 10200122004.

The previous prime is 20400244003. The next prime is 20400244019. The reversal of 20400244012 is 21044200402.

It is a super-2 number, since 2×20400244012² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20400244019) by changing a digit.

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 as a sum of consecutive naturals, namely, 2550030498 + ... + 2550030505.

Almost surely, 2^20400244012 is an apocalyptic number.

It is an amenable number.

20400244012 is a deficient number, since it is larger than the sum of its proper divisors (15300183016).

20400244012 is a wasteful number, since it uses less digits than its factorization.

20400244012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100061007 (or 5100061005 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 20400244012 its reverse (21044200402), we get a palindrome (41444444414).

The spelling of 20400244012 in words is "twenty billion, four hundred million, two hundred forty-four thousand, twelve".