21905920

素因数分解:

$2^9\times 5^1\times {\mathrm{43}}^1\times {\mathrm{199}}^1$

素因数の和:265

約数の個数: 80

約数和(自身を含む): 54014400

約数和(自身を除く): 32108480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 43, 64, 80, 86, 128, 160, 172, 199, 215, 256, 320, 344, 398, 430, 512, 640, 688, 796, 860, 995, 1280, 1376, 1592, 1720, 1990, 2560, 2752, 3184, 3440, 3980, 5504, 6368, 6880, 7960, 8557, 11008, 12736, 13760, 15920, 17114, 22016, 25472, 27520, 31840, 34228, 42785, 50944, 55040, 63680, 68456, 85570, 101888, 110080, 127360, 136912, 171140, 254720, 273824, 342280, 509440, 547648, 684560, 1095296, 1369120, 2190592, 2738240, 4381184, 5476480, 10952960, 21905920]

約数ペア:

[(1, 21905920), (2, 10952960), (4, 5476480), (5, 4381184), (8, 2738240), (10, 2190592), (16, 1369120), (20, 1095296), (32, 684560), (40, 547648), (43, 509440), (64, 342280), (80, 273824), (86, 254720), (128, 171140), (160, 136912), (172, 127360), (199, 110080), (215, 101888), (256, 85570), (320, 68456), (344, 63680), (398, 55040), (430, 50944), (512, 42785), (640, 34228), (688, 31840), (796, 27520), (860, 25472), (995, 22016), (1280, 17114), (1376, 15920), (1592, 13760), (1720, 12736), (1990, 11008), (2560, 8557), (2752, 7960), (3184, 6880), (3440, 6368), (3980, 5504)]