20796440 has 96 divisors (see below), whose sum is σ = 57028320. Its totient is φ = 6684672.

The previous prime is 20796401. The next prime is 20796449. The reversal of 20796440 is 4469702.

It is a junction number, because it is equal to n+sod(n) for n = 20796397 and 20796406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20796449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80792 + ... + 81048.

It is an arithmetic number, because the mean of its divisors is an integer number (594045).

Almost surely, 2^20796440 is an apocalyptic number.

20796440 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 20796440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28514160).

20796440 is an abundant number, since it is smaller than the sum of its proper divisors (36231880).

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

20796440 is a wasteful number, since it uses less digits than its factorization.

20796440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20796440 is about 4560.3113928766. The cubic root of 20796440 is about 274.9980826313.

The spelling of 20796440 in words is "twenty million, seven hundred ninety-six thousand, four hundred forty".