20868926955520 has 1792 divisors, whose sum is σ = 67264141824000. Its totient is φ = 6171792506880.

The previous prime is 20868926955473. The next prime is 20868926955557. The reversal of 20868926955520 is 2555962986802.

It is a tau number, because it is divible by the number of its divisors (1792).

It is a super-2 number, since 2×20868926955520² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 159304785855 + ... + 159304785985.

Almost surely, 2^{20868926955520} is an apocalyptic number.

20868926955520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20868926955520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33632070912000).

20868926955520 is an abundant number, since it is smaller than the sum of its proper divisors (46395214868480).

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

20868926955520 is a wasteful number, since it uses less digits than its factorization.

20868926955520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 186624000, while the sum is 67.

The spelling of 20868926955520 in words is "twenty trillion, eight hundred sixty-eight billion, nine hundred twenty-six million, nine hundred fifty-five thousand, five hundred twenty".