20633351091808 has 144 divisors (see below), whose sum is σ = 50957885265840. Its totient is φ = 8151592909824.

The previous prime is 20633351091799. The next prime is 20633351091817. The reversal of 20633351091808 is 80819015333602.

It is an interprime number because it is at equal distance from previous prime (20633351091799) and next prime (20633351091817).

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14378910 + ... + 15748642.

It is an arithmetic number, because the mean of its divisors is an integer number (353874203235).

Almost surely, 2^{20633351091808} is an apocalyptic number.

20633351091808 is a gapful number since it is divisible by the number (28) 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 20633351091808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25478942632920).

20633351091808 is an abundant number, since it is smaller than the sum of its proper divisors (30324534174032).

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

20633351091808 is a wasteful number, since it uses less digits than its factorization.

20633351091808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370509 (or 1370494 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 20633351091808 in words is "twenty trillion, six hundred thirty-three billion, three hundred fifty-one million, ninety-one thousand, eight hundred eight".