20440400001 has 16 divisors (see below), whose sum is σ = 31338369024. Its totient is φ = 11608568784.

The previous prime is 20440399961. The next prime is 20440400003. The reversal of 20440400001 is 10000404402.

It is not a de Polignac number, because 20440400001 - 2¹¹ = 20440397953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20440400003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2982321 + ... + 2989166.

It is an arithmetic number, because the mean of its divisors is an integer number (1958648064).

Almost surely, 2^20440400001 is an apocalyptic number.

20440400001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20440400001 is a deficient number, since it is larger than the sum of its proper divisors (10897969023).

20440400001 is a wasteful number, since it uses less digits than its factorization.

20440400001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5971660.

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 20440400001 its reverse (10000404402), we get a palindrome (30440804403).

The spelling of 20440400001 in words is "twenty billion, four hundred forty million, four hundred thousand, one".