20321156540636 has 48 divisors (see below), whose sum is σ = 42154706227200. Its totient is φ = 8386567616448.

The previous prime is 20321156540623. The next prime is 20321156540731. The reversal of 20321156540636 is 63604565112302.

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, 32708156 + ... + 33323651.

It is an arithmetic number, because the mean of its divisors is an integer number (878223046400).

Almost surely, 2^{20321156540636} is an apocalyptic number.

It is an amenable number.

20321156540636 is an abundant number, since it is smaller than the sum of its proper divisors (21833549686564).

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

20321156540636 is a wasteful number, since it uses less digits than its factorization.

20321156540636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66032226 (or 66032224 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 20321156540636 in words is "twenty trillion, three hundred twenty-one billion, one hundred fifty-six million, five hundred forty thousand, six hundred thirty-six".