661640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1$

素因数の和:174

約数の個数: 64

約数和(自身を含む): 1814400

約数和(自身を除く): 1152760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 17, 20, 28, 34, 35, 40, 56, 68, 70, 85, 119, 136, 139, 140, 170, 238, 278, 280, 340, 476, 556, 595, 680, 695, 952, 973, 1112, 1190, 1390, 1946, 2363, 2380, 2780, 3892, 4726, 4760, 4865, 5560, 7784, 9452, 9730, 11815, 16541, 18904, 19460, 23630, 33082, 38920, 47260, 66164, 82705, 94520, 132328, 165410, 330820, 661640]

約数ペア:

[(1, 661640), (2, 330820), (4, 165410), (5, 132328), (7, 94520), (8, 82705), (10, 66164), (14, 47260), (17, 38920), (20, 33082), (28, 23630), (34, 19460), (35, 18904), (40, 16541), (56, 11815), (68, 9730), (70, 9452), (85, 7784), (119, 5560), (136, 4865), (139, 4760), (140, 4726), (170, 3892), (238, 2780), (278, 2380), (280, 2363), (340, 1946), (476, 1390), (556, 1190), (595, 1112), (680, 973), (695, 952)]