28657920

素因数分解:

$2^8\times 3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{439}}^1$

素因数の和:480

約数の個数: 144

約数和(自身を含む): 97130880

約数和(自身を除く): 68472960

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, 256, 272, 320, 340, 384, 408, 439, 480, 510, 544, 640, 680, 768, 816, 878, 960, 1020, 1088, 1280, 1317, 1360, 1632, 1756, 1920, 2040, 2176, 2195, 2634, 2720, 3264, 3512, 3840, 4080, 4352, 4390, 5268, 5440, 6528, 6585, 7024, 7463, 8160, 8780, 10536, 10880, 13056, 13170, 14048, 14926, 16320, 17560, 21072, 21760, 22389, 26340, 28096, 29852, 32640, 35120, 37315, 42144, 44778, 52680, 56192, 59704, 65280, 70240, 74630, 84288, 89556, 105360, 111945, 112384, 119408, 140480, 149260, 168576, 179112, 210720, 223890, 238816, 280960, 298520, 337152, 358224, 421440, 447780, 477632, 561920, 597040, 716448, 842880, 895560, 955264, 1194080, 1432896, 1685760, 1791120, 1910528, 2388160, 2865792, 3582240, 4776320, 5731584, 7164480, 9552640, 14328960, 28657920]

約数ペア:

[(1, 28657920), (2, 14328960), (3, 9552640), (4, 7164480), (5, 5731584), (6, 4776320), (8, 3582240), (10, 2865792), (12, 2388160), (15, 1910528), (16, 1791120), (17, 1685760), (20, 1432896), (24, 1194080), (30, 955264), (32, 895560), (34, 842880), (40, 716448), (48, 597040), (51, 561920), (60, 477632), (64, 447780), (68, 421440), (80, 358224), (85, 337152), (96, 298520), (102, 280960), (120, 238816), (128, 223890), (136, 210720), (160, 179112), (170, 168576), (192, 149260), (204, 140480), (240, 119408), (255, 112384), (256, 111945), (272, 105360), (320, 89556), (340, 84288), (384, 74630), (408, 70240), (439, 65280), (480, 59704), (510, 56192), (544, 52680), (640, 44778), (680, 42144), (768, 37315), (816, 35120), (878, 32640), (960, 29852), (1020, 28096), (1088, 26340), (1280, 22389), (1317, 21760), (1360, 21072), (1632, 17560), (1756, 16320), (1920, 14926), (2040, 14048), (2176, 13170), (2195, 13056), (2634, 10880), (2720, 10536), (3264, 8780), (3512, 8160), (3840, 7463), (4080, 7024), (4352, 6585), (4390, 6528), (5268, 5440)]