21009909

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{97}}^1\times {\mathrm{137}}^1$

素因数の和:285

約数の個数: 32

約数和(自身を含む): 31159296

約数和(自身を除く): 10149387

約数列:

[1, 3, 17, 31, 51, 93, 97, 137, 291, 411, 527, 1581, 1649, 2329, 3007, 4247, 4947, 6987, 9021, 12741, 13289, 39867, 51119, 72199, 153357, 216597, 225913, 411959, 677739, 1235877, 7003303, 21009909]

約数ペア:

[(1, 21009909), (3, 7003303), (17, 1235877), (31, 677739), (51, 411959), (93, 225913), (97, 216597), (137, 153357), (291, 72199), (411, 51119), (527, 39867), (1581, 13289), (1649, 12741), (2329, 9021), (3007, 6987), (4247, 4947)]