20915280

素因数分解:

$2^4\times 3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{421}}^1$

素因数の和:466

約数の個数: 160

約数和(自身を含む): 75352320

約数和(自身を除く): 54437040

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 23, 24, 27, 30, 36, 40, 45, 46, 48, 54, 60, 69, 72, 80, 90, 92, 108, 115, 120, 135, 138, 144, 180, 184, 207, 216, 230, 240, 270, 276, 345, 360, 368, 414, 421, 432, 460, 540, 552, 621, 690, 720, 828, 842, 920, 1035, 1080, 1104, 1242, 1263, 1380, 1656, 1684, 1840, 2070, 2105, 2160, 2484, 2526, 2760, 3105, 3312, 3368, 3789, 4140, 4210, 4968, 5052, 5520, 6210, 6315, 6736, 7578, 8280, 8420, 9683, 9936, 10104, 11367, 12420, 12630, 15156, 16560, 16840, 18945, 19366, 20208, 22734, 24840, 25260, 29049, 30312, 33680, 37890, 38732, 45468, 48415, 49680, 50520, 56835, 58098, 60624, 75780, 77464, 87147, 90936, 96830, 101040, 113670, 116196, 145245, 151560, 154928, 174294, 181872, 193660, 227340, 232392, 261441, 290490, 303120, 348588, 387320, 435735, 454680, 464784, 522882, 580980, 697176, 774640, 871470, 909360, 1045764, 1161960, 1307205, 1394352, 1742940, 2091528, 2323920, 2614410, 3485880, 4183056, 5228820, 6971760, 10457640, 20915280]

約数ペア:

[(1, 20915280), (2, 10457640), (3, 6971760), (4, 5228820), (5, 4183056), (6, 3485880), (8, 2614410), (9, 2323920), (10, 2091528), (12, 1742940), (15, 1394352), (16, 1307205), (18, 1161960), (20, 1045764), (23, 909360), (24, 871470), (27, 774640), (30, 697176), (36, 580980), (40, 522882), (45, 464784), (46, 454680), (48, 435735), (54, 387320), (60, 348588), (69, 303120), (72, 290490), (80, 261441), (90, 232392), (92, 227340), (108, 193660), (115, 181872), (120, 174294), (135, 154928), (138, 151560), (144, 145245), (180, 116196), (184, 113670), (207, 101040), (216, 96830), (230, 90936), (240, 87147), (270, 77464), (276, 75780), (345, 60624), (360, 58098), (368, 56835), (414, 50520), (421, 49680), (432, 48415), (460, 45468), (540, 38732), (552, 37890), (621, 33680), (690, 30312), (720, 29049), (828, 25260), (842, 24840), (920, 22734), (1035, 20208), (1080, 19366), (1104, 18945), (1242, 16840), (1263, 16560), (1380, 15156), (1656, 12630), (1684, 12420), (1840, 11367), (2070, 10104), (2105, 9936), (2160, 9683), (2484, 8420), (2526, 8280), (2760, 7578), (3105, 6736), (3312, 6315), (3368, 6210), (3789, 5520), (4140, 5052), (4210, 4968)]