81355480

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{113}}^1\times {\mathrm{439}}^1$

素因数の和:604

約数の個数: 64

約数和(自身を含む): 189604800

約数和(自身を除く): 108249320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 113, 164, 205, 226, 328, 410, 439, 452, 565, 820, 878, 904, 1130, 1640, 1756, 2195, 2260, 3512, 4390, 4520, 4633, 8780, 9266, 17560, 17999, 18532, 23165, 35998, 37064, 46330, 49607, 71996, 89995, 92660, 99214, 143992, 179990, 185320, 198428, 248035, 359980, 396856, 496070, 719960, 992140, 1984280, 2033887, 4067774, 8135548, 10169435, 16271096, 20338870, 40677740, 81355480]

約数ペア:

[(1, 81355480), (2, 40677740), (4, 20338870), (5, 16271096), (8, 10169435), (10, 8135548), (20, 4067774), (40, 2033887), (41, 1984280), (82, 992140), (113, 719960), (164, 496070), (205, 396856), (226, 359980), (328, 248035), (410, 198428), (439, 185320), (452, 179990), (565, 143992), (820, 99214), (878, 92660), (904, 89995), (1130, 71996), (1640, 49607), (1756, 46330), (2195, 37064), (2260, 35998), (3512, 23165), (4390, 18532), (4520, 17999), (4633, 17560), (8780, 9266)]