20913767777952 has 192 divisors, whose sum is σ = 69715289226240. Its totient is φ = 5975128228608.

The previous prime is 20913767777951. The next prime is 20913767777999. The reversal of 20913767777952 is 25977776731902.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (20913767777951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206470423 + ... + 206571689.

It is an arithmetic number, because the mean of its divisors is an integer number (363100464720).

Almost surely, 2^{20913767777952} is an apocalyptic number.

It is an amenable number.

20913767777952 is an abundant number, since it is smaller than the sum of its proper divisors (48801521448288).

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

20913767777952 is a wasteful number, since it uses less digits than its factorization.

20913767777952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135440 (or 135426 counting only the distinct ones).

The product of its (nonzero) digits is 490092120, while the sum is 72.

The spelling of 20913767777952 in words is "twenty trillion, nine hundred thirteen billion, seven hundred sixty-seven million, seven hundred seventy-seven thousand, nine hundred fifty-two".