21044480

素因数分解:

$2^8\times 5^1\times {\mathrm{41}}^1\times {\mathrm{401}}^1$

素因数の和:463

約数の個数: 72

約数和(自身を含む): 51766344

約数和(自身を除く): 30721864

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 128, 160, 164, 205, 256, 320, 328, 401, 410, 640, 656, 802, 820, 1280, 1312, 1604, 1640, 2005, 2624, 3208, 3280, 4010, 5248, 6416, 6560, 8020, 10496, 12832, 13120, 16040, 16441, 25664, 26240, 32080, 32882, 51328, 52480, 64160, 65764, 82205, 102656, 128320, 131528, 164410, 256640, 263056, 328820, 513280, 526112, 657640, 1052224, 1315280, 2104448, 2630560, 4208896, 5261120, 10522240, 21044480]

約数ペア:

[(1, 21044480), (2, 10522240), (4, 5261120), (5, 4208896), (8, 2630560), (10, 2104448), (16, 1315280), (20, 1052224), (32, 657640), (40, 526112), (41, 513280), (64, 328820), (80, 263056), (82, 256640), (128, 164410), (160, 131528), (164, 128320), (205, 102656), (256, 82205), (320, 65764), (328, 64160), (401, 52480), (410, 51328), (640, 32882), (656, 32080), (802, 26240), (820, 25664), (1280, 16441), (1312, 16040), (1604, 13120), (1640, 12832), (2005, 10496), (2624, 8020), (3208, 6560), (3280, 6416), (4010, 5248)]