20805432 has 32 divisors (see below), whose sum is σ = 54276480. Its totient is φ = 6633440.

The previous prime is 20805431. The next prime is 20805451. The reversal of 20805432 is 23450802.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18294 + ... + 19397.

It is an arithmetic number, because the mean of its divisors is an integer number (1696140).

Almost surely, 2^20805432 is an apocalyptic number.

It is an amenable number.

20805432 is an abundant number, since it is smaller than the sum of its proper divisors (33471048).

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

20805432 is a wasteful number, since it uses less digits than its factorization.

20805432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37723 (or 37719 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20805432 is about 4561.2971839160. The cubic root of 20805432 is about 275.0377116327.

The spelling of 20805432 in words is "twenty million, eight hundred five thousand, four hundred thirty-two".