20791008 has 72 divisors (see below), whose sum is σ = 67577328. Its totient is φ = 5939712.

The previous prime is 20791007. The next prime is 20791019. The reversal of 20791008 is 80019702.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3141 + ... + 7172.

It is an arithmetic number, because the mean of its divisors is an integer number (938574).

Almost surely, 2^20791008 is an apocalyptic number.

20791008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20791008 is an abundant number, since it is smaller than the sum of its proper divisors (46786320).

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

20791008 is a wasteful number, since it uses less digits than its factorization.

20791008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10336 (or 10325 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20791008 is about 4559.7157806162. The cubic root of 20791008 is about 274.9741375127.

The spelling of 20791008 in words is "twenty million, seven hundred ninety-one thousand, eight".