20628270 has 96 divisors (see below), whose sum is σ = 59990112. Its totient is φ = 5069952.

The previous prime is 20628247. The next prime is 20628271. The reversal of 20628270 is 7282602.

It is a super-3 number, since 3×20628270³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628271) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 31264 + ... + 31916.

It is an arithmetic number, because the mean of its divisors is an integer number (624897).

Almost surely, 2^20628270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20628270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29995056).

20628270 is an abundant number, since it is smaller than the sum of its proper divisors (39361842).

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

20628270 is a wasteful number, since it uses less digits than its factorization.

20628270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20628270 is about 4541.8355320289. The cubic root of 20628270 is about 274.2548200416.

The spelling of 20628270 in words is "twenty million, six hundred twenty-eight thousand, two hundred seventy".