20894140453728 has 96 divisors (see below), whose sum is σ = 56057018976000. Its totient is φ = 6812261761536.

The previous prime is 20894140453699. The next prime is 20894140453729. The reversal of 20894140453728 is 82735404149802.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×20894140453728³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20894140453729) 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 15 ways as a sum of consecutive naturals, for example, 8141551 + ... + 10395822.

It is an arithmetic number, because the mean of its divisors is an integer number (583927281000).

Almost surely, 2^{20894140453728} is an apocalyptic number.

It is an amenable number.

20894140453728 is an abundant number, since it is smaller than the sum of its proper divisors (35162878522272).

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

20894140453728 is a wasteful number, since it uses less digits than its factorization.

20894140453728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18537644 (or 18537636 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 20894140453728 in words is "twenty trillion, eight hundred ninety-four billion, one hundred forty million, four hundred fifty-three thousand, seven hundred twenty-eight".