20343653563440 has 40 divisors (see below), whose sum is σ = 63065326047408. Its totient is φ = 5424974283520.

The previous prime is 20343653563411. The next prime is 20343653563489. The reversal of 20343653563440 is 4436535634302.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20343653563440.

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 7 ways as a sum of consecutive naturals, for example, 42382611351 + ... + 42382611830.

Almost surely, 2^{20343653563440} is an apocalyptic number.

20343653563440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20343653563440 is an abundant number, since it is smaller than the sum of its proper divisors (42721672483968).

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

20343653563440 is a wasteful number, since it uses less digits than its factorization.

20343653563440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84765223197 (or 84765223191 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 48.

The spelling of 20343653563440 in words is "twenty trillion, three hundred forty-three billion, six hundred fifty-three million, five hundred sixty-three thousand, four hundred forty".