20400044044240 has 80 divisors (see below), whose sum is σ = 54407340385920. Its totient is φ = 6968299645440.

The previous prime is 20400044044181. The next prime is 20400044044249. The reversal of 20400044044240 is 4244044000402.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20400044044199 and 20400044044208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400044044249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67560606 + ... + 67861885.

It is an arithmetic number, because the mean of its divisors is an integer number (680091754824).

Almost surely, 2^{20400044044240} is an apocalyptic number.

20400044044240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400044044240 is an abundant number, since it is smaller than the sum of its proper divisors (34007296341680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20400044044240 is a wasteful number, since it uses less digits than its factorization.

20400044044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135422780 (or 135422774 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 20400044044240 its reverse (4244044000402), we get a palindrome (24644088044642).

The spelling of 20400044044240 in words is "twenty trillion, four hundred billion, forty-four million, forty-four thousand, two hundred forty".