81321680

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{271}}^1$

素因数の和:337

約数の個数: 120

約数和(自身を含む): 215319552

約数和(自身を除く): 133997872

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 31, 40, 44, 55, 62, 80, 88, 110, 121, 124, 155, 176, 220, 242, 248, 271, 310, 341, 440, 484, 496, 542, 605, 620, 682, 880, 968, 1084, 1210, 1240, 1355, 1364, 1705, 1936, 2168, 2420, 2480, 2710, 2728, 2981, 3410, 3751, 4336, 4840, 5420, 5456, 5962, 6820, 7502, 8401, 9680, 10840, 11924, 13640, 14905, 15004, 16802, 18755, 21680, 23848, 27280, 29810, 30008, 32791, 33604, 37510, 42005, 47696, 59620, 60016, 65582, 67208, 75020, 84010, 92411, 119240, 131164, 134416, 150040, 163955, 168020, 184822, 238480, 262328, 300080, 327910, 336040, 369644, 462055, 524656, 655820, 672080, 739288, 924110, 1016521, 1311640, 1478576, 1848220, 2033042, 2623280, 3696440, 4066084, 5082605, 7392880, 8132168, 10165210, 16264336, 20330420, 40660840, 81321680]

約数ペア:

[(1, 81321680), (2, 40660840), (4, 20330420), (5, 16264336), (8, 10165210), (10, 8132168), (11, 7392880), (16, 5082605), (20, 4066084), (22, 3696440), (31, 2623280), (40, 2033042), (44, 1848220), (55, 1478576), (62, 1311640), (80, 1016521), (88, 924110), (110, 739288), (121, 672080), (124, 655820), (155, 524656), (176, 462055), (220, 369644), (242, 336040), (248, 327910), (271, 300080), (310, 262328), (341, 238480), (440, 184822), (484, 168020), (496, 163955), (542, 150040), (605, 134416), (620, 131164), (682, 119240), (880, 92411), (968, 84010), (1084, 75020), (1210, 67208), (1240, 65582), (1355, 60016), (1364, 59620), (1705, 47696), (1936, 42005), (2168, 37510), (2420, 33604), (2480, 32791), (2710, 30008), (2728, 29810), (2981, 27280), (3410, 23848), (3751, 21680), (4336, 18755), (4840, 16802), (5420, 15004), (5456, 14905), (5962, 13640), (6820, 11924), (7502, 10840), (8401, 9680)]