21487960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^2\times {\mathrm{43}}^1$

素因数の和:129

約数の個数: 96

約数和(自身を含む): 55051920

約数和(自身を除く): 33563960

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 43, 52, 62, 65, 86, 104, 124, 130, 155, 172, 215, 248, 260, 310, 344, 403, 430, 520, 559, 620, 806, 860, 961, 1118, 1240, 1333, 1612, 1720, 1922, 2015, 2236, 2666, 2795, 3224, 3844, 4030, 4472, 4805, 5332, 5590, 6665, 7688, 8060, 9610, 10664, 11180, 12493, 13330, 16120, 17329, 19220, 22360, 24986, 26660, 34658, 38440, 41323, 49972, 53320, 62465, 69316, 82646, 86645, 99944, 124930, 138632, 165292, 173290, 206615, 249860, 330584, 346580, 413230, 499720, 537199, 693160, 826460, 1074398, 1652920, 2148796, 2685995, 4297592, 5371990, 10743980, 21487960]

約数ペア:

[(1, 21487960), (2, 10743980), (4, 5371990), (5, 4297592), (8, 2685995), (10, 2148796), (13, 1652920), (20, 1074398), (26, 826460), (31, 693160), (40, 537199), (43, 499720), (52, 413230), (62, 346580), (65, 330584), (86, 249860), (104, 206615), (124, 173290), (130, 165292), (155, 138632), (172, 124930), (215, 99944), (248, 86645), (260, 82646), (310, 69316), (344, 62465), (403, 53320), (430, 49972), (520, 41323), (559, 38440), (620, 34658), (806, 26660), (860, 24986), (961, 22360), (1118, 19220), (1240, 17329), (1333, 16120), (1612, 13330), (1720, 12493), (1922, 11180), (2015, 10664), (2236, 9610), (2666, 8060), (2795, 7688), (3224, 6665), (3844, 5590), (4030, 5332), (4472, 4805)]