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20918272 = 2125107
BaseRepresentation
bin100111111001…
…1000000000000
31110100202110211
41033303000000
520323341042
62024203504
7342542134
oct117630000
943322424
1020918272
1110898231
127009594
13444539b
142ac73c4
151c83017
hex13f3000

20918272 has 26 divisors (see below), whose sum is σ = 41839628. Its totient is φ = 10457088.

The previous prime is 20918267. The next prime is 20918291. The reversal of 20918272 is 27281902.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1543 + ... + 6649.

Almost surely, 220918272 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 20918272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20919814).

20918272 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20918272 is an frugal number, since it uses more digits than its factorization.

20918272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131 (or 5109 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20918272 is about 4573.6497460999. The cubic root of 20918272 is about 275.5340454169.

It can be divided in two parts, 209 and 18272, that added together give a palindrome (18481).

The spelling of 20918272 in words is "twenty million, nine hundred eighteen thousand, two hundred seventy-two".

Divisors: 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 5107 10214 20428 40856 81712 163424 326848 653696 1307392 2614784 5229568 10459136 20918272