20605746 has 64 divisors (see below), whose sum is σ = 49932288. Its totient is φ = 5541888.

The previous prime is 20605733. The next prime is 20605757. The reversal of 20605746 is 64750602.

It is an unprimeable number.

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, 80050 + ... + 80306.

It is an arithmetic number, because the mean of its divisors is an integer number (780192).

Almost surely, 2^20605746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20605746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24966144).

20605746 is an abundant number, since it is smaller than the sum of its proper divisors (29326542).

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

20605746 is a wasteful number, since it uses less digits than its factorization.

20605746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20605746 is about 4539.3552405601. The cubic root of 20605746 is about 274.1549641114.

The spelling of 20605746 in words is "twenty million, six hundred five thousand, seven hundred forty-six".