21106215

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{331}}^1$

素因数の和:464

約数の個数: 48

約数和(自身を含む): 39879840

約数和(自身を除く): 18773625

約数列:

[1, 3, 5, 9, 13, 15, 39, 45, 65, 109, 117, 195, 327, 331, 545, 585, 981, 993, 1417, 1635, 1655, 2979, 4251, 4303, 4905, 4965, 7085, 12753, 12909, 14895, 21255, 21515, 36079, 38727, 63765, 64545, 108237, 180395, 193635, 324711, 469027, 541185, 1407081, 1623555, 2345135, 4221243, 7035405, 21106215]

約数ペア:

[(1, 21106215), (3, 7035405), (5, 4221243), (9, 2345135), (13, 1623555), (15, 1407081), (39, 541185), (45, 469027), (65, 324711), (109, 193635), (117, 180395), (195, 108237), (327, 64545), (331, 63765), (545, 38727), (585, 36079), (981, 21515), (993, 21255), (1417, 14895), (1635, 12909), (1655, 12753), (2979, 7085), (4251, 4965), (4303, 4905)]