20813760 has 280 divisors, whose sum is σ = 81875376. Its totient is φ = 4976640.

The previous prime is 20813753. The next prime is 20813761. The reversal of 20813760 is 6731802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 285084 + ... + 285156.

Almost surely, 2^20813760 is an apocalyptic number.

20813760 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 20813760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40937688).

20813760 is an abundant number, since it is smaller than the sum of its proper divisors (61061616).

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

20813760 is a wasteful number, since it uses less digits than its factorization.

20813760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20813760 is about 4562.2099907830. The cubic root of 20813760 is about 275.0744041098.

The spelling of 20813760 in words is "twenty million, eight hundred thirteen thousand, seven hundred sixty".