20344633055640 has 96 divisors (see below), whose sum is σ = 70009472594880. Its totient is φ = 5106103981056.

The previous prime is 20344633055629. The next prime is 20344633055701. The reversal of 20344633055640 is 4655033644302.

20344633055640 is a `hidden beast` number, since 2 + 0 + 3 + 4 + 4 + 63 + 30 + 556 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1662137104 + ... + 1662149343.

It is an arithmetic number, because the mean of its divisors is an integer number (729265339530).

Almost surely, 2^{20344633055640} is an apocalyptic number.

20344633055640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20344633055640 is an abundant number, since it is smaller than the sum of its proper divisors (49664839539240).

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

20344633055640 is a wasteful number, since it uses less digits than its factorization.

20344633055640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324286481 (or 3324286474 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 45.

Adding to 20344633055640 its reverse (4655033644302), we get a palindrome (24999666699942).

The spelling of 20344633055640 in words is "twenty trillion, three hundred forty-four billion, six hundred thirty-three million, fifty-five thousand, six hundred forty".