20415644506540 has 48 divisors (see below), whose sum is σ = 43920417772224. Its totient is φ = 7966738841600.

The previous prime is 20415644506529. The next prime is 20415644506567. The reversal of 20415644506540 is 4560544651402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19019052 + ... + 20063788.

It is an arithmetic number, because the mean of its divisors is an integer number (915008703588).

Almost surely, 2^{20415644506540} is an apocalyptic number.

20415644506540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20415644506540 is an abundant number, since it is smaller than the sum of its proper divisors (23504773265684).

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

20415644506540 is a wasteful number, since it uses less digits than its factorization.

20415644506540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068618 (or 1068616 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 46.

The spelling of 20415644506540 in words is "twenty trillion, four hundred fifteen billion, six hundred forty-four million, five hundred six thousand, five hundred forty".