20791040 has 72 divisors (see below), whose sum is σ = 51263520. Its totient is φ = 8073216.

The previous prime is 20791037. The next prime is 20791081. The reversal of 20791040 is 4019702.

It is a junction number, because it is equal to n+sod(n) for n = 20790997 and 20791015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47141 + ... + 47579.

Almost surely, 2^20791040 is an apocalyptic number.

20791040 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 20791040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25631760).

20791040 is an abundant number, since it is smaller than the sum of its proper divisors (30472480).

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

20791040 is an equidigital number, since it uses as much as digits as its factorization.

20791040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20791040 is about 4559.7192896054. The cubic root of 20791040 is about 274.9742785860.

It can be divided in two parts, 2079 and 1040, that multiplied together give a triangular number (2162160 = T₂₀₇₉).

The spelling of 20791040 in words is "twenty million, seven hundred ninety-one thousand, forty".