21299980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:179

約数の個数: 96

約数和(自身を含む): 52496640

約数和(自身を除く): 31196660

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 61, 65, 68, 79, 85, 122, 130, 158, 170, 221, 244, 260, 305, 316, 340, 395, 442, 610, 790, 793, 884, 1027, 1037, 1105, 1220, 1343, 1580, 1586, 2054, 2074, 2210, 2686, 3172, 3965, 4108, 4148, 4420, 4819, 5135, 5185, 5372, 6715, 7930, 9638, 10270, 10370, 13430, 13481, 15860, 17459, 19276, 20540, 20740, 24095, 26860, 26962, 34918, 48190, 53924, 62647, 67405, 69836, 81923, 87295, 96380, 125294, 134810, 163846, 174590, 250588, 269620, 313235, 327692, 349180, 409615, 626470, 819230, 1064999, 1252940, 1638460, 2129998, 4259996, 5324995, 10649990, 21299980]

約数ペア:

[(1, 21299980), (2, 10649990), (4, 5324995), (5, 4259996), (10, 2129998), (13, 1638460), (17, 1252940), (20, 1064999), (26, 819230), (34, 626470), (52, 409615), (61, 349180), (65, 327692), (68, 313235), (79, 269620), (85, 250588), (122, 174590), (130, 163846), (158, 134810), (170, 125294), (221, 96380), (244, 87295), (260, 81923), (305, 69836), (316, 67405), (340, 62647), (395, 53924), (442, 48190), (610, 34918), (790, 26962), (793, 26860), (884, 24095), (1027, 20740), (1037, 20540), (1105, 19276), (1220, 17459), (1343, 15860), (1580, 13481), (1586, 13430), (2054, 10370), (2074, 10270), (2210, 9638), (2686, 7930), (3172, 6715), (3965, 5372), (4108, 5185), (4148, 5135), (4420, 4819)]