21798280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{613}}^1$

素因数の和:758

約数の個数: 64

約数和(自身を含む): 56586240

約数和(自身を除く): 34787960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 127, 140, 254, 280, 508, 613, 635, 889, 1016, 1226, 1270, 1778, 2452, 2540, 3065, 3556, 4291, 4445, 4904, 5080, 6130, 7112, 8582, 8890, 12260, 17164, 17780, 21455, 24520, 34328, 35560, 42910, 77851, 85820, 155702, 171640, 311404, 389255, 544957, 622808, 778510, 1089914, 1557020, 2179828, 2724785, 3114040, 4359656, 5449570, 10899140, 21798280]

約数ペア:

[(1, 21798280), (2, 10899140), (4, 5449570), (5, 4359656), (7, 3114040), (8, 2724785), (10, 2179828), (14, 1557020), (20, 1089914), (28, 778510), (35, 622808), (40, 544957), (56, 389255), (70, 311404), (127, 171640), (140, 155702), (254, 85820), (280, 77851), (508, 42910), (613, 35560), (635, 34328), (889, 24520), (1016, 21455), (1226, 17780), (1270, 17164), (1778, 12260), (2452, 8890), (2540, 8582), (3065, 7112), (3556, 6130), (4291, 5080), (4445, 4904)]