20091050821028 has 48 divisors (see below), whose sum is σ = 40613333644800. Its totient is φ = 8594789383680.

The previous prime is 20091050821027. The next prime is 20091050821067. The reversal of 20091050821028 is 82012805019002.

It is a super-4 number, since 4×20091050821028⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a junction number, because it is equal to n+sod(n) for n = 20091050820982 and 20091050821000.

It is not an unprimeable number, because it can be changed into a prime (20091050821027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20708378 + ... + 21656846.

It is an arithmetic number, because the mean of its divisors is an integer number (846111117600).

Almost surely, 2^{20091050821028} is an apocalyptic number.

It is an amenable number.

20091050821028 is an abundant number, since it is smaller than the sum of its proper divisors (20522282823772).

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

20091050821028 is a wasteful number, since it uses less digits than its factorization.

20091050821028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976820 (or 976818 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 20091050821028 in words is "twenty trillion, ninety-one billion, fifty million, eight hundred twenty-one thousand, twenty-eight".