20987520

素因数分解:

$2^7\times 3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{643}}^1$

素因数の和:682

約数の個数: 128

約数和(自身を含む): 70943040

約数和(自身を除く): 49955520

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 17, 20, 24, 30, 32, 34, 40, 48, 51, 60, 64, 68, 80, 85, 96, 102, 120, 128, 136, 160, 170, 192, 204, 240, 255, 272, 320, 340, 384, 408, 480, 510, 544, 640, 643, 680, 816, 960, 1020, 1088, 1286, 1360, 1632, 1920, 1929, 2040, 2176, 2572, 2720, 3215, 3264, 3858, 4080, 5144, 5440, 6430, 6528, 7716, 8160, 9645, 10288, 10880, 10931, 12860, 15432, 16320, 19290, 20576, 21862, 25720, 30864, 32640, 32793, 38580, 41152, 43724, 51440, 54655, 61728, 65586, 77160, 82304, 87448, 102880, 109310, 123456, 131172, 154320, 163965, 174896, 205760, 218620, 246912, 262344, 308640, 327930, 349792, 411520, 437240, 524688, 617280, 655860, 699584, 874480, 1049376, 1234560, 1311720, 1399168, 1748960, 2098752, 2623440, 3497920, 4197504, 5246880, 6995840, 10493760, 20987520]

約数ペア:

[(1, 20987520), (2, 10493760), (3, 6995840), (4, 5246880), (5, 4197504), (6, 3497920), (8, 2623440), (10, 2098752), (12, 1748960), (15, 1399168), (16, 1311720), (17, 1234560), (20, 1049376), (24, 874480), (30, 699584), (32, 655860), (34, 617280), (40, 524688), (48, 437240), (51, 411520), (60, 349792), (64, 327930), (68, 308640), (80, 262344), (85, 246912), (96, 218620), (102, 205760), (120, 174896), (128, 163965), (136, 154320), (160, 131172), (170, 123456), (192, 109310), (204, 102880), (240, 87448), (255, 82304), (272, 77160), (320, 65586), (340, 61728), (384, 54655), (408, 51440), (480, 43724), (510, 41152), (544, 38580), (640, 32793), (643, 32640), (680, 30864), (816, 25720), (960, 21862), (1020, 20576), (1088, 19290), (1286, 16320), (1360, 15432), (1632, 12860), (1920, 10931), (1929, 10880), (2040, 10288), (2176, 9645), (2572, 8160), (2720, 7716), (3215, 6528), (3264, 6430), (3858, 5440), (4080, 5144)]