20791120 has 80 divisors (see below), whose sum is σ = 55853568. Its totient is φ = 7050240.

The previous prime is 20791091. The next prime is 20791129. The reversal of 20791120 is 2119702.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 20791091 and 20791100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791129) 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, 76585 + ... + 76855.

Almost surely, 2^20791120 is an apocalyptic number.

20791120 is a gapful number since it is divisible by the number (20) 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 20791120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27926784).

20791120 is an abundant number, since it is smaller than the sum of its proper divisors (35062448).

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

20791120 is a wasteful number, since it uses less digits than its factorization.

20791120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20791120 is about 4559.7280620669. The cubic root of 20791120 is about 274.9746312686.

The spelling of 20791120 in words is "twenty million, seven hundred ninety-one thousand, one hundred twenty".