21249405

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{197}}^1$

素因数の和:275

約数の個数: 64

約数和(自身を含む): 41057280

約数和(自身を除く): 19807875

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 47, 51, 85, 135, 141, 153, 197, 235, 255, 423, 459, 591, 705, 765, 799, 985, 1269, 1773, 2115, 2295, 2397, 2955, 3349, 3995, 5319, 6345, 7191, 8865, 9259, 10047, 11985, 16745, 21573, 26595, 27777, 30141, 35955, 46295, 50235, 83331, 90423, 107865, 138885, 150705, 157403, 249993, 416655, 452115, 472209, 787015, 1249965, 1416627, 2361045, 4249881, 7083135, 21249405]

約数ペア:

[(1, 21249405), (3, 7083135), (5, 4249881), (9, 2361045), (15, 1416627), (17, 1249965), (27, 787015), (45, 472209), (47, 452115), (51, 416655), (85, 249993), (135, 157403), (141, 150705), (153, 138885), (197, 107865), (235, 90423), (255, 83331), (423, 50235), (459, 46295), (591, 35955), (705, 30141), (765, 27777), (799, 26595), (985, 21573), (1269, 16745), (1773, 11985), (2115, 10047), (2295, 9259), (2397, 8865), (2955, 7191), (3349, 6345), (3995, 5319)]