20636616646554 has 32 divisors (see below), whose sum is σ = 41801180958720. Its totient is φ = 6790903861872.

The previous prime is 20636616646553. The next prime is 20636616646651. The reversal of 20636616646554 is 45564661663602.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20636616646553) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 744067 + ... + 6467369.

It is an arithmetic number, because the mean of its divisors is an integer number (1306286904960).

Almost surely, 2^{20636616646554} is an apocalyptic number.

20636616646554 is an abundant number, since it is smaller than the sum of its proper divisors (21164564312166).

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

20636616646554 is a wasteful number, since it uses less digits than its factorization.

20636616646554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5730994.

The product of its (nonzero) digits is 111974400, while the sum is 60.

The spelling of 20636616646554 in words is "twenty trillion, six hundred thirty-six billion, six hundred sixteen million, six hundred forty-six thousand, five hundred fifty-four".