20344664463440 has 40 divisors (see below), whose sum is σ = 47397681720288. Its totient is φ = 8121291704960.

The previous prime is 20344664463379. The next prime is 20344664463491. The reversal of 20344664463440 is 4436446644302.

It is a happy number.

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

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, 258930482 + ... + 259009041.

Almost surely, 2^{20344664463440} is an apocalyptic number.

20344664463440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20344664463440 is an abundant number, since it is smaller than the sum of its proper divisors (27053017256848).

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

20344664463440 is a wasteful number, since it uses less digits than its factorization.

20344664463440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517940027 (or 517940021 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 50.

The spelling of 20344664463440 in words is "twenty trillion, three hundred forty-four billion, six hundred sixty-four million, four hundred sixty-three thousand, four hundred forty".