20683520 has 144 divisors (see below), whose sum is σ = 58720032. Its totient is φ = 6881280.

The previous prime is 20683493. The next prime is 20683529. The reversal of 20683520 is 2538602.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 20683520.

It is not an unprimeable number, because it can be changed into a prime (20683529) 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 15 ways as a sum of consecutive naturals, for example, 182984 + ... + 183096.

It is an arithmetic number, because the mean of its divisors is an integer number (407778).

Almost surely, 2^20683520 is an apocalyptic number.

20683520 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 20683520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29360016).

20683520 is an abundant number, since it is smaller than the sum of its proper divisors (38036512).

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

20683520 is a wasteful number, since it uses less digits than its factorization.

20683520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20683520 is about 4547.9138074506. The cubic root of 20683520 is about 274.4994531084.

The spelling of 20683520 in words is "twenty million, six hundred eighty-three thousand, five hundred twenty".