20640336145344 has 56 divisors (see below), whose sum is σ = 60678765987920. Its totient is φ = 6880112047872.

The previous prime is 20640336145249. The next prime is 20640336145369. The reversal of 20640336145344 is 44354163304602.

It is a happy number.

20640336145344 is a `hidden beast` number, since 20 + 6 + 4 + 0 + 3 + 3 + 614 + 5 + 3 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20640336145344.

It is a congruent number.

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, 5972317759 + ... + 5972321214.

Almost surely, 2^{20640336145344} is an apocalyptic number.

20640336145344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20640336145344 is an abundant number, since it is smaller than the sum of its proper divisors (40038429842576).

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

20640336145344 is a wasteful number, since it uses less digits than its factorization.

20640336145344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11944638994 (or 11944638978 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 45.

Adding to 20640336145344 its reverse (44354163304602), we get a palindrome (64994499449946).

The spelling of 20640336145344 in words is "twenty trillion, six hundred forty billion, three hundred thirty-six million, one hundred forty-five thousand, three hundred forty-four".