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20300280 = 2335711133
BaseRepresentation
bin100110101110…
…0000111111000
31102012100202020
41031130013320
520144102110
62003034440
7334356330
oct115340770
942170666
1020300280
11105059a0
12696ba20
13428a000
1429a60c0
151baed70
hex135c1f8

20300280 has 256 divisors, whose sum is σ = 82252800. Its totient is φ = 3893760.

The previous prime is 20300279. The next prime is 20300299. The reversal of 20300280 is 8200302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 1561554 + ... + 1561566.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

Almost surely, 220300280 is an apocalyptic number.

20300280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20300280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41126400).

20300280 is an abundant number, since it is smaller than the sum of its proper divisors (61952520).

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

20300280 is a wasteful number, since it uses less digits than its factorization.

20300280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20300280 is about 4505.5832030937. The cubic root of 20300280 is about 272.7934946262.

Adding to 20300280 its reverse (8200302), we get a palindrome (28500582).

The spelling of 20300280 in words is "twenty million, three hundred thousand, two hundred eighty".