20323281628881 has 192 divisors, whose sum is σ = 40366812672000. Its totient is φ = 9976602867840.

The previous prime is 20323281628801. The next prime is 20323281628921. The reversal of 20323281628881 is 18882618232302.

20323281628881 is a `hidden beast` number, since 2 + 0 + 3 + 2 + 3 + 2 + 8 + 1 + 628 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 20323281628881 - 2⁷ = 20323281628753 is a prime.

It is a super-2 number, since 2×20323281628881² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20323281628801) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 19323450 + ... + 20348028.

It is an arithmetic number, because the mean of its divisors is an integer number (210243816000).

Almost surely, 2^{20323281628881} is an apocalyptic number.

20323281628881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20323281628881 is a deficient number, since it is larger than the sum of its proper divisors (20043531043119).

20323281628881 is a wasteful number, since it uses less digits than its factorization.

20323281628881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024689 (or 1024676 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 20323281628881 in words is "twenty trillion, three hundred twenty-three billion, two hundred eighty-one million, six hundred twenty-eight thousand, eight hundred eighty-one".