21120155

素因数分解:

$5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{347}}^1$

素因数の和:443

約数の個数: 32

約数和(自身を含む): 30468096

約数和(自身を除く): 9347941

約数列:

[1, 5, 7, 35, 37, 47, 185, 235, 259, 329, 347, 1295, 1645, 1735, 1739, 2429, 8695, 12145, 12173, 12839, 16309, 60865, 64195, 81545, 89873, 114163, 449365, 570815, 603433, 3017165, 4224031, 21120155]

約数ペア:

[(1, 21120155), (5, 4224031), (7, 3017165), (35, 603433), (37, 570815), (47, 449365), (185, 114163), (235, 89873), (259, 81545), (329, 64195), (347, 60865), (1295, 16309), (1645, 12839), (1735, 12173), (1739, 12145), (2429, 8695)]