21255760

素因数分解:

$2^4\times 5^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{167}}^1$

素因数の和:260

約数の個数: 80

約数和(自身を含む): 52246656

約数和(自身を除く): 30990896

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 37, 40, 43, 74, 80, 86, 148, 167, 172, 185, 215, 296, 334, 344, 370, 430, 592, 668, 688, 740, 835, 860, 1336, 1480, 1591, 1670, 1720, 2672, 2960, 3182, 3340, 3440, 6179, 6364, 6680, 7181, 7955, 12358, 12728, 13360, 14362, 15910, 24716, 25456, 28724, 30895, 31820, 35905, 49432, 57448, 61790, 63640, 71810, 98864, 114896, 123580, 127280, 143620, 247160, 265697, 287240, 494320, 531394, 574480, 1062788, 1328485, 2125576, 2656970, 4251152, 5313940, 10627880, 21255760]

約数ペア:

[(1, 21255760), (2, 10627880), (4, 5313940), (5, 4251152), (8, 2656970), (10, 2125576), (16, 1328485), (20, 1062788), (37, 574480), (40, 531394), (43, 494320), (74, 287240), (80, 265697), (86, 247160), (148, 143620), (167, 127280), (172, 123580), (185, 114896), (215, 98864), (296, 71810), (334, 63640), (344, 61790), (370, 57448), (430, 49432), (592, 35905), (668, 31820), (688, 30895), (740, 28724), (835, 25456), (860, 24716), (1336, 15910), (1480, 14362), (1591, 13360), (1670, 12728), (1720, 12358), (2672, 7955), (2960, 7181), (3182, 6680), (3340, 6364), (3440, 6179)]