20811583265140 has 48 divisors (see below), whose sum is σ = 43724362752000. Its totient is φ = 8320817325312.

The previous prime is 20811583265129. The next prime is 20811583265159. The reversal of 20811583265140 is 4156238511802.

It is a congruent number.

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, 599964877 + ... + 599999563.

It is an arithmetic number, because the mean of its divisors is an integer number (910924224000).

Almost surely, 2^{20811583265140} is an apocalyptic number.

20811583265140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20811583265140 is an abundant number, since it is smaller than the sum of its proper divisors (22912779486860).

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

20811583265140 is a wasteful number, since it uses less digits than its factorization.

20811583265140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47584 (or 47582 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 20811583265140 in words is "twenty trillion, eight hundred eleven billion, five hundred eighty-three million, two hundred sixty-five thousand, one hundred forty".