21298977

素因数分解:

$3^3\times 7^2\times {\mathrm{17}}^1\times {\mathrm{947}}^1$

素因数の和:987

約数の個数: 48

約数和(自身を含む): 38905920

約数和(自身を除く): 17606943

約数列:

[1, 3, 7, 9, 17, 21, 27, 49, 51, 63, 119, 147, 153, 189, 357, 441, 459, 833, 947, 1071, 1323, 2499, 2841, 3213, 6629, 7497, 8523, 16099, 19887, 22491, 25569, 46403, 48297, 59661, 112693, 139209, 144891, 178983, 338079, 417627, 434673, 788851, 1014237, 1252881, 2366553, 3042711, 7099659, 21298977]

約数ペア:

[(1, 21298977), (3, 7099659), (7, 3042711), (9, 2366553), (17, 1252881), (21, 1014237), (27, 788851), (49, 434673), (51, 417627), (63, 338079), (119, 178983), (147, 144891), (153, 139209), (189, 112693), (357, 59661), (441, 48297), (459, 46403), (833, 25569), (947, 22491), (1071, 19887), (1323, 16099), (2499, 8523), (2841, 7497), (3213, 6629)]