21518991

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{349}}^1$

素因数の和:416

約数の個数: 48

約数和(自身を含む): 36691200

約数和(自身を除く): 15172209

約数列:

[1, 3, 9, 13, 17, 31, 39, 51, 93, 117, 153, 221, 279, 349, 403, 527, 663, 1047, 1209, 1581, 1989, 3141, 3627, 4537, 4743, 5933, 6851, 10819, 13611, 17799, 20553, 32457, 40833, 53397, 61659, 77129, 97371, 140647, 183923, 231387, 421941, 551769, 694161, 1265823, 1655307, 2390999, 7172997, 21518991]

約数ペア:

[(1, 21518991), (3, 7172997), (9, 2390999), (13, 1655307), (17, 1265823), (31, 694161), (39, 551769), (51, 421941), (93, 231387), (117, 183923), (153, 140647), (221, 97371), (279, 77129), (349, 61659), (403, 53397), (527, 40833), (663, 32457), (1047, 20553), (1209, 17799), (1581, 13611), (1989, 10819), (3141, 6851), (3627, 5933), (4537, 4743)]