19744780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{41}}^1\times {\mathrm{199}}^1$

素因数の和:271

約数の個数: 72

約数和(自身を含む): 46922400

約数和(自身を除く): 27177620

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 41, 44, 55, 82, 110, 121, 164, 199, 205, 220, 242, 398, 410, 451, 484, 605, 796, 820, 902, 995, 1210, 1804, 1990, 2189, 2255, 2420, 3980, 4378, 4510, 4961, 8159, 8756, 9020, 9922, 10945, 16318, 19844, 21890, 24079, 24805, 32636, 40795, 43780, 48158, 49610, 81590, 89749, 96316, 99220, 120395, 163180, 179498, 240790, 358996, 448745, 481580, 897490, 987239, 1794980, 1974478, 3948956, 4936195, 9872390, 19744780]

約数ペア:

[(1, 19744780), (2, 9872390), (4, 4936195), (5, 3948956), (10, 1974478), (11, 1794980), (20, 987239), (22, 897490), (41, 481580), (44, 448745), (55, 358996), (82, 240790), (110, 179498), (121, 163180), (164, 120395), (199, 99220), (205, 96316), (220, 89749), (242, 81590), (398, 49610), (410, 48158), (451, 43780), (484, 40795), (605, 32636), (796, 24805), (820, 24079), (902, 21890), (995, 19844), (1210, 16318), (1804, 10945), (1990, 9922), (2189, 9020), (2255, 8756), (2420, 8159), (3980, 4961), (4378, 4510)]