20345736 has 64 divisors (see below), whose sum is σ = 55054080. Its totient is φ = 6241280.

The previous prime is 20345723. The next prime is 20345747. The reversal of 20345736 is 63754302.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18646 + ... + 19706.

It is an arithmetic number, because the mean of its divisors is an integer number (860220).

Almost surely, 2^20345736 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 20345736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27527040).

20345736 is an abundant number, since it is smaller than the sum of its proper divisors (34708344).

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

20345736 is a wasteful number, since it uses less digits than its factorization.

20345736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 20345736 is about 4510.6247904254. The cubic root of 20345736 is about 272.9969541718.

The spelling of 20345736 in words is "twenty million, three hundred forty-five thousand, seven hundred thirty-six".