20289920

素因数分解:

$2^7\times 5^1\times 7^2\times {\mathrm{647}}^1$

素因数の和:680

約数の個数: 96

約数和(自身を含む): 56512080

約数和(自身を除く): 36222160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 56, 64, 70, 80, 98, 112, 128, 140, 160, 196, 224, 245, 280, 320, 392, 448, 490, 560, 640, 647, 784, 896, 980, 1120, 1294, 1568, 1960, 2240, 2588, 3136, 3235, 3920, 4480, 4529, 5176, 6272, 6470, 7840, 9058, 10352, 12940, 15680, 18116, 20704, 22645, 25880, 31360, 31703, 36232, 41408, 45290, 51760, 63406, 72464, 82816, 90580, 103520, 126812, 144928, 158515, 181160, 207040, 253624, 289856, 317030, 362320, 414080, 507248, 579712, 634060, 724640, 1014496, 1268120, 1449280, 2028992, 2536240, 2898560, 4057984, 5072480, 10144960, 20289920]

約数ペア:

[(1, 20289920), (2, 10144960), (4, 5072480), (5, 4057984), (7, 2898560), (8, 2536240), (10, 2028992), (14, 1449280), (16, 1268120), (20, 1014496), (28, 724640), (32, 634060), (35, 579712), (40, 507248), (49, 414080), (56, 362320), (64, 317030), (70, 289856), (80, 253624), (98, 207040), (112, 181160), (128, 158515), (140, 144928), (160, 126812), (196, 103520), (224, 90580), (245, 82816), (280, 72464), (320, 63406), (392, 51760), (448, 45290), (490, 41408), (560, 36232), (640, 31703), (647, 31360), (784, 25880), (896, 22645), (980, 20704), (1120, 18116), (1294, 15680), (1568, 12940), (1960, 10352), (2240, 9058), (2588, 7840), (3136, 6470), (3235, 6272), (3920, 5176), (4480, 4529)]