21685840

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{1297}}^1$

素因数の和:1340

約数の個数: 80

約数和(自身を含む): 57942720

約数和(自身を除く): 36256880

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 19, 20, 22, 38, 40, 44, 55, 76, 80, 88, 95, 110, 152, 176, 190, 209, 220, 304, 380, 418, 440, 760, 836, 880, 1045, 1297, 1520, 1672, 2090, 2594, 3344, 4180, 5188, 6485, 8360, 10376, 12970, 14267, 16720, 20752, 24643, 25940, 28534, 49286, 51880, 57068, 71335, 98572, 103760, 114136, 123215, 142670, 197144, 228272, 246430, 271073, 285340, 394288, 492860, 542146, 570680, 985720, 1084292, 1141360, 1355365, 1971440, 2168584, 2710730, 4337168, 5421460, 10842920, 21685840]

約数ペア:

[(1, 21685840), (2, 10842920), (4, 5421460), (5, 4337168), (8, 2710730), (10, 2168584), (11, 1971440), (16, 1355365), (19, 1141360), (20, 1084292), (22, 985720), (38, 570680), (40, 542146), (44, 492860), (55, 394288), (76, 285340), (80, 271073), (88, 246430), (95, 228272), (110, 197144), (152, 142670), (176, 123215), (190, 114136), (209, 103760), (220, 98572), (304, 71335), (380, 57068), (418, 51880), (440, 49286), (760, 28534), (836, 25940), (880, 24643), (1045, 20752), (1297, 16720), (1520, 14267), (1672, 12970), (2090, 10376), (2594, 8360), (3344, 6485), (4180, 5188)]