21431475

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{431}}^1$

素因数の和:477

約数の個数: 72

約数和(自身を含む): 43872192

約数和(自身を除く): 22440717

約数列:

[1, 3, 5, 9, 13, 15, 17, 25, 39, 45, 51, 65, 75, 85, 117, 153, 195, 221, 225, 255, 325, 425, 431, 585, 663, 765, 975, 1105, 1275, 1293, 1989, 2155, 2925, 3315, 3825, 3879, 5525, 5603, 6465, 7327, 9945, 10775, 16575, 16809, 19395, 21981, 28015, 32325, 36635, 49725, 50427, 65943, 84045, 95251, 96975, 109905, 140075, 183175, 252135, 285753, 329715, 420225, 476255, 549525, 857259, 1260675, 1428765, 1648575, 2381275, 4286295, 7143825, 21431475]

約数ペア:

[(1, 21431475), (3, 7143825), (5, 4286295), (9, 2381275), (13, 1648575), (15, 1428765), (17, 1260675), (25, 857259), (39, 549525), (45, 476255), (51, 420225), (65, 329715), (75, 285753), (85, 252135), (117, 183175), (153, 140075), (195, 109905), (221, 96975), (225, 95251), (255, 84045), (325, 65943), (425, 50427), (431, 49725), (585, 36635), (663, 32325), (765, 28015), (975, 21981), (1105, 19395), (1275, 16809), (1293, 16575), (1989, 10775), (2155, 9945), (2925, 7327), (3315, 6465), (3825, 5603), (3879, 5525)]