20356717546540 has 48 divisors (see below), whose sum is σ = 45003610310400. Its totient is φ = 7713344463552.

The previous prime is 20356717546421. The next prime is 20356717546609. The reversal of 20356717546540 is 4564571765302.

It is a happy 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, 1061001 + ... + 6468319.

It is an arithmetic number, because the mean of its divisors is an integer number (937575214800).

Almost surely, 2^{20356717546540} is an apocalyptic number.

20356717546540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20356717546540 is an abundant number, since it is smaller than the sum of its proper divisors (24646892763860).

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

20356717546540 is a wasteful number, since it uses less digits than its factorization.

20356717546540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5417254 (or 5417252 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 55.

The spelling of 20356717546540 in words is "twenty trillion, three hundred fifty-six billion, seven hundred seventeen million, five hundred forty-six thousand, five hundred forty".