20877935900643 has 64 divisors (see below), whose sum is σ = 31265059200000. Its totient is φ = 13768948892160.

The previous prime is 20877935900629. The next prime is 20877935900681. The reversal of 20877935900643 is 34600953977802.

20877935900643 is a `hidden beast` number, since 208 + 7 + 79 + 359 + 0 + 0 + 6 + 4 + 3 = 666.

It is a Cunningham number, because it is equal to 4569238²-1.

It is not a de Polignac number, because 20877935900643 - 2⁶ = 20877935900579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20877935900623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 909266683 + ... + 909289643.

It is an arithmetic number, because the mean of its divisors is an integer number (488516550000).

Almost surely, 2^{20877935900643} is an apocalyptic number.

20877935900643 is a deficient number, since it is larger than the sum of its proper divisors (10387123299357).

20877935900643 is a wasteful number, since it uses less digits than its factorization.

20877935900643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24137 (or 24131 counting only the distinct ones).

The product of its (nonzero) digits is 68584320, while the sum is 63.

The spelling of 20877935900643 in words is "twenty trillion, eight hundred seventy-seven billion, nine hundred thirty-five million, nine hundred thousand, six hundred forty-three".