18254020

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{113}}^1\times {\mathrm{197}}^1$

素因数の和:360

約数の個数: 48

約数和(自身を含む): 39817008

約数和(自身を除く): 21562988

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 113, 164, 197, 205, 226, 394, 410, 452, 565, 788, 820, 985, 1130, 1970, 2260, 3940, 4633, 8077, 9266, 16154, 18532, 22261, 23165, 32308, 40385, 44522, 46330, 80770, 89044, 92660, 111305, 161540, 222610, 445220, 912701, 1825402, 3650804, 4563505, 9127010, 18254020]

約数ペア:

[(1, 18254020), (2, 9127010), (4, 4563505), (5, 3650804), (10, 1825402), (20, 912701), (41, 445220), (82, 222610), (113, 161540), (164, 111305), (197, 92660), (205, 89044), (226, 80770), (394, 46330), (410, 44522), (452, 40385), (565, 32308), (788, 23165), (820, 22261), (985, 18532), (1130, 16154), (1970, 9266), (2260, 8077), (3940, 4633)]