20305736 has 32 divisors (see below), whose sum is σ = 41899680. Its totient is φ = 9225040.

The previous prime is 20305693. The next prime is 20305777. The reversal of 20305736 is 63750302.

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 7 ways as a sum of consecutive naturals, for example, 9695 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (1309365).

Almost surely, 2^20305736 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 20305736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20949840).

20305736 is an abundant number, since it is smaller than the sum of its proper divisors (21593944).

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

20305736 is a wasteful number, since it uses less digits than its factorization.

20305736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946 (or 1920 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 20305736 is about 4506.1886334240. The cubic root of 20305736 is about 272.8179315303.

The spelling of 20305736 in words is "twenty million, three hundred five thousand, seven hundred thirty-six".