20728350 has 72 divisors (see below), whose sum is σ = 56542512. Its totient is φ = 5443200.

The previous prime is 20728339. The next prime is 20728387. The reversal of 20728350 is 5382702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 32535 + ... + 33165.

Almost surely, 2^20728350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20728350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28271256).

20728350 is an abundant number, since it is smaller than the sum of its proper divisors (35814162).

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

20728350 is a wasteful number, since it uses less digits than its factorization.

20728350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20728350 is about 4552.8397731526. The cubic root of 20728350 is about 274.6976290883.

The spelling of 20728350 in words is "twenty million, seven hundred twenty-eight thousand, three hundred fifty".