21493980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{2777}}^1$

素因数の和:2835

約数の個数: 72

約数和(自身を含む): 66738672

約数和(自身を除く): 45244692

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 43, 45, 60, 86, 90, 129, 172, 180, 215, 258, 387, 430, 516, 645, 774, 860, 1290, 1548, 1935, 2580, 2777, 3870, 5554, 7740, 8331, 11108, 13885, 16662, 24993, 27770, 33324, 41655, 49986, 55540, 83310, 99972, 119411, 124965, 166620, 238822, 249930, 358233, 477644, 499860, 597055, 716466, 1074699, 1194110, 1432932, 1791165, 2149398, 2388220, 3582330, 4298796, 5373495, 7164660, 10746990, 21493980]

約数ペア:

[(1, 21493980), (2, 10746990), (3, 7164660), (4, 5373495), (5, 4298796), (6, 3582330), (9, 2388220), (10, 2149398), (12, 1791165), (15, 1432932), (18, 1194110), (20, 1074699), (30, 716466), (36, 597055), (43, 499860), (45, 477644), (60, 358233), (86, 249930), (90, 238822), (129, 166620), (172, 124965), (180, 119411), (215, 99972), (258, 83310), (387, 55540), (430, 49986), (516, 41655), (645, 33324), (774, 27770), (860, 24993), (1290, 16662), (1548, 13885), (1935, 11108), (2580, 8331), (2777, 7740), (3870, 5554)]