20728162144540 has 12 divisors (see below), whose sum is σ = 43529140503576. Its totient is φ = 8291264857808.

The previous prime is 20728162144523. The next prime is 20728162144567. The reversal of 20728162144540 is 4544126182702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518204053594 + ... + 518204053633.

It is an arithmetic number, because the mean of its divisors is an integer number (3627428375298).

Almost surely, 2^{20728162144540} is an apocalyptic number.

20728162144540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20728162144540 is an abundant number, since it is smaller than the sum of its proper divisors (22800978359036).

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

20728162144540 is a wasteful number, since it uses less digits than its factorization.

20728162144540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036408107236 (or 1036408107234 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 46.

The spelling of 20728162144540 in words is "twenty trillion, seven hundred twenty-eight billion, one hundred sixty-two million, one hundred forty-four thousand, five hundred forty".