20404026444640 has 96 divisors (see below), whose sum is σ = 49976789909760. Its totient is φ = 7863841843200.

The previous prime is 20404026444619. The next prime is 20404026444647. The reversal of 20404026444640 is 4644462040402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20404026444593 and 20404026444602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404026444647) 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, 7846071 + ... + 10117750.

It is an arithmetic number, because the mean of its divisors is an integer number (520591561560).

Almost surely, 2^{20404026444640} is an apocalyptic number.

20404026444640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404026444640 is an abundant number, since it is smaller than the sum of its proper divisors (29572763465120).

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

20404026444640 is a wasteful number, since it uses less digits than its factorization.

20404026444640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17964096 (or 17964088 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 40.

The spelling of 20404026444640 in words is "twenty trillion, four hundred four billion, twenty-six million, four hundred forty-four thousand, six hundred forty".