18816980

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{13}}^1\times {\mathrm{211}}^1$

素因数の和:254

約数の個数: 96

約数和(自身を含む): 49862400

約数和(自身を除く): 31045420

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 49, 52, 65, 70, 91, 98, 130, 140, 182, 196, 211, 245, 260, 343, 364, 422, 455, 490, 637, 686, 844, 910, 980, 1055, 1274, 1372, 1477, 1715, 1820, 2110, 2548, 2743, 2954, 3185, 3430, 4220, 4459, 5486, 5908, 6370, 6860, 7385, 8918, 10339, 10972, 12740, 13715, 14770, 17836, 19201, 20678, 22295, 27430, 29540, 38402, 41356, 44590, 51695, 54860, 72373, 76804, 89180, 96005, 103390, 134407, 144746, 192010, 206780, 268814, 289492, 361865, 384020, 537628, 672035, 723730, 940849, 1344070, 1447460, 1881698, 2688140, 3763396, 4704245, 9408490, 18816980]

約数ペア:

[(1, 18816980), (2, 9408490), (4, 4704245), (5, 3763396), (7, 2688140), (10, 1881698), (13, 1447460), (14, 1344070), (20, 940849), (26, 723730), (28, 672035), (35, 537628), (49, 384020), (52, 361865), (65, 289492), (70, 268814), (91, 206780), (98, 192010), (130, 144746), (140, 134407), (182, 103390), (196, 96005), (211, 89180), (245, 76804), (260, 72373), (343, 54860), (364, 51695), (422, 44590), (455, 41356), (490, 38402), (637, 29540), (686, 27430), (844, 22295), (910, 20678), (980, 19201), (1055, 17836), (1274, 14770), (1372, 13715), (1477, 12740), (1715, 10972), (1820, 10339), (2110, 8918), (2548, 7385), (2743, 6860), (2954, 6370), (3185, 5908), (3430, 5486), (4220, 4459)]