20004430401644 has 24 divisors (see below), whose sum is σ = 37708579732320. Its totient is φ = 9230873842944.

The previous prime is 20004430401589. The next prime is 20004430401679. The reversal of 20004430401644 is 44610403440002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20004430401644.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40170749 + ... + 40665684.

It is an arithmetic number, because the mean of its divisors is an integer number (1571190822180).

Almost surely, 2^{20004430401644} is an apocalyptic number.

It is an amenable number.

20004430401644 is a deficient number, since it is larger than the sum of its proper divisors (17704149330676).

20004430401644 is a wasteful number, since it uses less digits than its factorization.

20004430401644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80841209 (or 80841207 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 20004430401644 its reverse (44610403440002), we get a palindrome (64614833841646).

The spelling of 20004430401644 in words is "twenty trillion, four billion, four hundred thirty million, four hundred one thousand, six hundred forty-four".