21278985

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{131}}^1$

素因数の和:183

約数の個数: 96

約数和(自身を含む): 45505152

約数和(自身を除く): 24226167

約数列:

[1, 3, 5, 7, 13, 15, 17, 21, 35, 39, 49, 51, 65, 85, 91, 105, 119, 131, 147, 195, 221, 245, 255, 273, 357, 393, 455, 595, 637, 655, 663, 735, 833, 917, 1105, 1365, 1547, 1703, 1785, 1911, 1965, 2227, 2499, 2751, 3185, 3315, 4165, 4585, 4641, 5109, 6419, 6681, 7735, 8515, 9555, 10829, 11135, 11921, 12495, 13755, 15589, 19257, 23205, 25545, 28951, 32095, 32487, 33405, 35763, 46767, 54145, 59605, 77945, 83447, 86853, 96285, 109123, 144755, 162435, 178815, 202657, 233835, 250341, 327369, 417235, 434265, 545615, 607971, 1013285, 1251705, 1418599, 1636845, 3039855, 4255797, 7092995, 21278985]

約数ペア:

[(1, 21278985), (3, 7092995), (5, 4255797), (7, 3039855), (13, 1636845), (15, 1418599), (17, 1251705), (21, 1013285), (35, 607971), (39, 545615), (49, 434265), (51, 417235), (65, 327369), (85, 250341), (91, 233835), (105, 202657), (119, 178815), (131, 162435), (147, 144755), (195, 109123), (221, 96285), (245, 86853), (255, 83447), (273, 77945), (357, 59605), (393, 54145), (455, 46767), (595, 35763), (637, 33405), (655, 32487), (663, 32095), (735, 28951), (833, 25545), (917, 23205), (1105, 19257), (1365, 15589), (1547, 13755), (1703, 12495), (1785, 11921), (1911, 11135), (1965, 10829), (2227, 9555), (2499, 8515), (2751, 7735), (3185, 6681), (3315, 6419), (4165, 5109), (4585, 4641)]