21970179

素因数分解:

$3^2\times 7^3\times {\mathrm{11}}^1\times {\mathrm{647}}^1$

素因数の和:685

約数の個数: 48

約数和(自身を含む): 40435200

約数和(自身を除く): 18465021

約数列:

[1, 3, 7, 9, 11, 21, 33, 49, 63, 77, 99, 147, 231, 343, 441, 539, 647, 693, 1029, 1617, 1941, 3087, 3773, 4529, 4851, 5823, 7117, 11319, 13587, 21351, 31703, 33957, 40761, 49819, 64053, 95109, 149457, 221921, 285327, 348733, 448371, 665763, 1046199, 1997289, 2441131, 3138597, 7323393, 21970179]

約数ペア:

[(1, 21970179), (3, 7323393), (7, 3138597), (9, 2441131), (11, 1997289), (21, 1046199), (33, 665763), (49, 448371), (63, 348733), (77, 285327), (99, 221921), (147, 149457), (231, 95109), (343, 64053), (441, 49819), (539, 40761), (647, 33957), (693, 31703), (1029, 21351), (1617, 13587), (1941, 11319), (3087, 7117), (3773, 5823), (4529, 4851)]