20853756631764 has 144 divisors (see below), whose sum is σ = 64230416328960. Its totient is φ = 5831445553920.

The previous prime is 20853756631733. The next prime is 20853756631817. The reversal of 20853756631764 is 46713665735802.

20853756631764 is a `hidden beast` number, since 2 + 0 + 8 + 5 + 3 + 7 + 566 + 3 + 1 + 7 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 41672757 + ... + 42170204.

It is an arithmetic number, because the mean of its divisors is an integer number (446044557840).

Almost surely, 2^{20853756631764} is an apocalyptic number.

It is an amenable number.

20853756631764 is an abundant number, since it is smaller than the sum of its proper divisors (43376659697196).

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

20853756631764 is a wasteful number, since it uses less digits than its factorization.

20853756631764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83843035 (or 83843020 counting only the distinct ones).

The product of its (nonzero) digits is 152409600, while the sum is 63.

The spelling of 20853756631764 in words is "twenty trillion, eight hundred fifty-three billion, seven hundred fifty-six million, six hundred thirty-one thousand, seven hundred sixty-four".