20920911021396 has 120 divisors (see below), whose sum is σ = 57975961760640. Its totient is φ = 6555780811008.

The previous prime is 20920911021371. The next prime is 20920911021401. The reversal of 20920911021396 is 69312011902902.

20920911021396 is a `hidden beast` number, since 20 + 9 + 209 + 1 + 10 + 21 + 396 = 666.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 2520501 + ... + 6942243.

It is an arithmetic number, because the mean of its divisors is an integer number (483133014672).

Almost surely, 2^{20920911021396} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20920911021396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28987980880320).

20920911021396 is an abundant number, since it is smaller than the sum of its proper divisors (37055050739244).

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

20920911021396 is a wasteful number, since it uses less digits than its factorization.

20920911021396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422635 (or 4422624 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 20920911021396 in words is "twenty trillion, nine hundred twenty billion, nine hundred eleven million, twenty-one thousand, three hundred ninety-six".