19720000

素因数分解:

$2^6\times 5^4\times {\mathrm{17}}^1\times {\mathrm{29}}^1$

素因数の和:78

約数の個数: 140

約数和(自身を含む): 53560980

約数和(自身を除く): 33840980

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 25, 29, 32, 34, 40, 50, 58, 64, 68, 80, 85, 100, 116, 125, 136, 145, 160, 170, 200, 232, 250, 272, 290, 320, 340, 400, 425, 464, 493, 500, 544, 580, 625, 680, 725, 800, 850, 928, 986, 1000, 1088, 1160, 1250, 1360, 1450, 1600, 1700, 1856, 1972, 2000, 2125, 2320, 2465, 2500, 2720, 2900, 3400, 3625, 3944, 4000, 4250, 4640, 4930, 5000, 5440, 5800, 6800, 7250, 7888, 8000, 8500, 9280, 9860, 10000, 10625, 11600, 12325, 13600, 14500, 15776, 17000, 18125, 19720, 20000, 21250, 23200, 24650, 27200, 29000, 31552, 34000, 36250, 39440, 40000, 42500, 46400, 49300, 58000, 61625, 68000, 72500, 78880, 85000, 98600, 116000, 123250, 136000, 145000, 157760, 170000, 197200, 232000, 246500, 290000, 308125, 340000, 394400, 493000, 580000, 616250, 680000, 788800, 986000, 1160000, 1232500, 1972000, 2465000, 3944000, 4930000, 9860000, 19720000]

約数ペア:

[(1, 19720000), (2, 9860000), (4, 4930000), (5, 3944000), (8, 2465000), (10, 1972000), (16, 1232500), (17, 1160000), (20, 986000), (25, 788800), (29, 680000), (32, 616250), (34, 580000), (40, 493000), (50, 394400), (58, 340000), (64, 308125), (68, 290000), (80, 246500), (85, 232000), (100, 197200), (116, 170000), (125, 157760), (136, 145000), (145, 136000), (160, 123250), (170, 116000), (200, 98600), (232, 85000), (250, 78880), (272, 72500), (290, 68000), (320, 61625), (340, 58000), (400, 49300), (425, 46400), (464, 42500), (493, 40000), (500, 39440), (544, 36250), (580, 34000), (625, 31552), (680, 29000), (725, 27200), (800, 24650), (850, 23200), (928, 21250), (986, 20000), (1000, 19720), (1088, 18125), (1160, 17000), (1250, 15776), (1360, 14500), (1450, 13600), (1600, 12325), (1700, 11600), (1856, 10625), (1972, 10000), (2000, 9860), (2125, 9280), (2320, 8500), (2465, 8000), (2500, 7888), (2720, 7250), (2900, 6800), (3400, 5800), (3625, 5440), (3944, 5000), (4000, 4930), (4250, 4640)]