21987680

素因数分解:

$2^5\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{31}}^2$

素因数の和:101

約数の個数: 144

約数和(自身を含む): 63059472

約数和(自身を除く): 41071792

約数列:

[1, 2, 4, 5, 8, 10, 11, 13, 16, 20, 22, 26, 31, 32, 40, 44, 52, 55, 62, 65, 80, 88, 104, 110, 124, 130, 143, 155, 160, 176, 208, 220, 248, 260, 286, 310, 341, 352, 403, 416, 440, 496, 520, 572, 620, 682, 715, 806, 880, 961, 992, 1040, 1144, 1240, 1364, 1430, 1612, 1705, 1760, 1922, 2015, 2080, 2288, 2480, 2728, 2860, 3224, 3410, 3844, 4030, 4433, 4576, 4805, 4960, 5456, 5720, 6448, 6820, 7688, 8060, 8866, 9610, 10571, 10912, 11440, 12493, 12896, 13640, 15376, 16120, 17732, 19220, 21142, 22165, 22880, 24986, 27280, 30752, 32240, 35464, 38440, 42284, 44330, 49972, 52855, 54560, 62465, 64480, 70928, 76880, 84568, 88660, 99944, 105710, 124930, 137423, 141856, 153760, 169136, 177320, 199888, 211420, 249860, 274846, 338272, 354640, 399776, 422840, 499720, 549692, 687115, 709280, 845680, 999440, 1099384, 1374230, 1691360, 1998880, 2198768, 2748460, 4397536, 5496920, 10993840, 21987680]

約数ペア:

[(1, 21987680), (2, 10993840), (4, 5496920), (5, 4397536), (8, 2748460), (10, 2198768), (11, 1998880), (13, 1691360), (16, 1374230), (20, 1099384), (22, 999440), (26, 845680), (31, 709280), (32, 687115), (40, 549692), (44, 499720), (52, 422840), (55, 399776), (62, 354640), (65, 338272), (80, 274846), (88, 249860), (104, 211420), (110, 199888), (124, 177320), (130, 169136), (143, 153760), (155, 141856), (160, 137423), (176, 124930), (208, 105710), (220, 99944), (248, 88660), (260, 84568), (286, 76880), (310, 70928), (341, 64480), (352, 62465), (403, 54560), (416, 52855), (440, 49972), (496, 44330), (520, 42284), (572, 38440), (620, 35464), (682, 32240), (715, 30752), (806, 27280), (880, 24986), (961, 22880), (992, 22165), (1040, 21142), (1144, 19220), (1240, 17732), (1364, 16120), (1430, 15376), (1612, 13640), (1705, 12896), (1760, 12493), (1922, 11440), (2015, 10912), (2080, 10571), (2288, 9610), (2480, 8866), (2728, 8060), (2860, 7688), (3224, 6820), (3410, 6448), (3844, 5720), (4030, 5456), (4433, 4960), (4576, 4805)]