21240225

素因数分解:

$3^4\times 5^2\times {\mathrm{17}}^1\times {\mathrm{617}}^1$

素因数の和:656

約数の個数: 60

約数和(自身を含む): 41726124

約数和(自身を除く): 20485899

約数列:

[1, 3, 5, 9, 15, 17, 25, 27, 45, 51, 75, 81, 85, 135, 153, 225, 255, 405, 425, 459, 617, 675, 765, 1275, 1377, 1851, 2025, 2295, 3085, 3825, 5553, 6885, 9255, 10489, 11475, 15425, 16659, 27765, 31467, 34425, 46275, 49977, 52445, 83295, 94401, 138825, 157335, 249885, 262225, 283203, 416475, 472005, 786675, 849609, 1249425, 1416015, 2360025, 4248045, 7080075, 21240225]

約数ペア:

[(1, 21240225), (3, 7080075), (5, 4248045), (9, 2360025), (15, 1416015), (17, 1249425), (25, 849609), (27, 786675), (45, 472005), (51, 416475), (75, 283203), (81, 262225), (85, 249885), (135, 157335), (153, 138825), (225, 94401), (255, 83295), (405, 52445), (425, 49977), (459, 46275), (617, 34425), (675, 31467), (765, 27765), (1275, 16659), (1377, 15425), (1851, 11475), (2025, 10489), (2295, 9255), (3085, 6885), (3825, 5553)]