21708405

素因数分解:

$3^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{1051}}^1$

素因数の和:1088

約数の個数: 48

約数和(自身を含む): 41356224

約数和(自身を除く): 19647819

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 243, 255, 405, 459, 765, 1051, 1215, 1377, 2295, 3153, 4131, 5255, 6885, 9459, 15765, 17867, 20655, 28377, 47295, 53601, 85131, 89335, 141885, 160803, 255393, 268005, 425655, 482409, 804015, 1276965, 1447227, 2412045, 4341681, 7236135, 21708405]

約数ペア:

[(1, 21708405), (3, 7236135), (5, 4341681), (9, 2412045), (15, 1447227), (17, 1276965), (27, 804015), (45, 482409), (51, 425655), (81, 268005), (85, 255393), (135, 160803), (153, 141885), (243, 89335), (255, 85131), (405, 53601), (459, 47295), (765, 28377), (1051, 20655), (1215, 17867), (1377, 15765), (2295, 9459), (3153, 6885), (4131, 5255)]