21371985

素因数分解:

$3^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{53}}^1\times {\mathrm{103}}^1$

素因数の和:199

約数の個数: 64

約数和(自身を含む): 40435200

約数和(自身を除く): 19063215

約数列:

[1, 3, 5, 9, 15, 27, 29, 45, 53, 87, 103, 135, 145, 159, 261, 265, 309, 435, 477, 515, 783, 795, 927, 1305, 1431, 1537, 1545, 2385, 2781, 2987, 3915, 4611, 4635, 5459, 7155, 7685, 8961, 13833, 13905, 14935, 16377, 23055, 26883, 27295, 41499, 44805, 49131, 69165, 80649, 81885, 134415, 147393, 158311, 207495, 245655, 403245, 474933, 736965, 791555, 1424799, 2374665, 4274397, 7123995, 21371985]

約数ペア:

[(1, 21371985), (3, 7123995), (5, 4274397), (9, 2374665), (15, 1424799), (27, 791555), (29, 736965), (45, 474933), (53, 403245), (87, 245655), (103, 207495), (135, 158311), (145, 147393), (159, 134415), (261, 81885), (265, 80649), (309, 69165), (435, 49131), (477, 44805), (515, 41499), (783, 27295), (795, 26883), (927, 23055), (1305, 16377), (1431, 14935), (1537, 13905), (1545, 13833), (2385, 8961), (2781, 7685), (2987, 7155), (3915, 5459), (4611, 4635)]