20997990

素因数分解:

$2^1\times 3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{137}}^1$

素因数の和:294

約数の個数: 96

約数和(自身を含む): 59675616

約数和(自身を除く): 38677626

約数列:

[1, 2, 3, 5, 6, 9, 10, 13, 15, 18, 26, 30, 39, 45, 65, 78, 90, 117, 130, 131, 137, 195, 234, 262, 274, 390, 393, 411, 585, 655, 685, 786, 822, 1170, 1179, 1233, 1310, 1370, 1703, 1781, 1965, 2055, 2358, 2466, 3406, 3562, 3930, 4110, 5109, 5343, 5895, 6165, 8515, 8905, 10218, 10686, 11790, 12330, 15327, 16029, 17030, 17810, 17947, 25545, 26715, 30654, 32058, 35894, 51090, 53430, 53841, 76635, 80145, 89735, 107682, 153270, 160290, 161523, 179470, 233311, 269205, 323046, 466622, 538410, 699933, 807615, 1166555, 1399866, 1615230, 2099799, 2333110, 3499665, 4199598, 6999330, 10498995, 20997990]

約数ペア:

[(1, 20997990), (2, 10498995), (3, 6999330), (5, 4199598), (6, 3499665), (9, 2333110), (10, 2099799), (13, 1615230), (15, 1399866), (18, 1166555), (26, 807615), (30, 699933), (39, 538410), (45, 466622), (65, 323046), (78, 269205), (90, 233311), (117, 179470), (130, 161523), (131, 160290), (137, 153270), (195, 107682), (234, 89735), (262, 80145), (274, 76635), (390, 53841), (393, 53430), (411, 51090), (585, 35894), (655, 32058), (685, 30654), (786, 26715), (822, 25545), (1170, 17947), (1179, 17810), (1233, 17030), (1310, 16029), (1370, 15327), (1703, 12330), (1781, 11790), (1965, 10686), (2055, 10218), (2358, 8905), (2466, 8515), (3406, 6165), (3562, 5895), (3930, 5343), (4110, 5109)]