21207105

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{271}}^1$

素因数の和:366

約数の個数: 48

約数和(自身を含む): 38697984

約数和(自身を除く): 17490879

約数列:

[1, 3, 5, 9, 15, 37, 45, 47, 111, 141, 185, 235, 271, 333, 423, 555, 705, 813, 1355, 1665, 1739, 2115, 2439, 4065, 5217, 8695, 10027, 12195, 12737, 15651, 26085, 30081, 38211, 50135, 63685, 78255, 90243, 114633, 150405, 191055, 451215, 471269, 573165, 1413807, 2356345, 4241421, 7069035, 21207105]

約数ペア:

[(1, 21207105), (3, 7069035), (5, 4241421), (9, 2356345), (15, 1413807), (37, 573165), (45, 471269), (47, 451215), (111, 191055), (141, 150405), (185, 114633), (235, 90243), (271, 78255), (333, 63685), (423, 50135), (555, 38211), (705, 30081), (813, 26085), (1355, 15651), (1665, 12737), (1739, 12195), (2115, 10027), (2439, 8695), (4065, 5217)]