20344663202440 has 32 divisors (see below), whose sum is σ = 46749438852480. Its totient is φ = 7964719210432.

The previous prime is 20344663202407. The next prime is 20344663202467. The reversal of 20344663202440 is 4420236644302.

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 = 20344663202393 and 20344663202402.

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, 5410812802 + ... + 5410816561.

It is an arithmetic number, because the mean of its divisors is an integer number (1460919964140).

Almost surely, 2^{20344663202440} is an apocalyptic number.

20344663202440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20344663202440 is an abundant number, since it is smaller than the sum of its proper divisors (26404775650040).

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

20344663202440 is a wasteful number, since it uses less digits than its factorization.

20344663202440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10821629421 (or 10821629417 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 40.

Adding to 20344663202440 its reverse (4420236644302), we get a palindrome (24764899846742).

The spelling of 20344663202440 in words is "twenty trillion, three hundred forty-four billion, six hundred sixty-three million, two hundred two thousand, four hundred forty".