20666832 has 160 divisors (see below), whose sum is σ = 62853120. Its totient is φ = 5806080.

The previous prime is 20666827. The next prime is 20666839. The reversal of 20666832 is 23866602.

It is a junction number, because it is equal to n+sod(n) for n = 20666793 and 20666802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666839) 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 31 ways as a sum of consecutive naturals, for example, 480603 + ... + 480645.

It is an arithmetic number, because the mean of its divisors is an integer number (392832).

Almost surely, 2^20666832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31426560).

20666832 is an abundant number, since it is smaller than the sum of its proper divisors (42186288).

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

20666832 is a wasteful number, since it uses less digits than its factorization.

20666832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 20666832 is about 4546.0787498678. The cubic root of 20666832 is about 274.4256088207.

The spelling of 20666832 in words is "twenty million, six hundred sixty-six thousand, eight hundred thirty-two".