21055755

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{73}}^1$

素因数の和:196

約数の個数: 64

約数和(自身を含む): 40578048

約数和(自身を除く): 19522293

約数列:

[1, 3, 5, 7, 15, 21, 35, 41, 67, 73, 105, 123, 201, 205, 219, 287, 335, 365, 469, 511, 615, 861, 1005, 1095, 1407, 1435, 1533, 2345, 2555, 2747, 2993, 4305, 4891, 7035, 7665, 8241, 8979, 13735, 14673, 14965, 19229, 20951, 24455, 34237, 41205, 44895, 57687, 62853, 73365, 96145, 102711, 104755, 171185, 200531, 288435, 314265, 513555, 601593, 1002655, 1403717, 3007965, 4211151, 7018585, 21055755]

約数ペア:

[(1, 21055755), (3, 7018585), (5, 4211151), (7, 3007965), (15, 1403717), (21, 1002655), (35, 601593), (41, 513555), (67, 314265), (73, 288435), (105, 200531), (123, 171185), (201, 104755), (205, 102711), (219, 96145), (287, 73365), (335, 62853), (365, 57687), (469, 44895), (511, 41205), (615, 34237), (861, 24455), (1005, 20951), (1095, 19229), (1407, 14965), (1435, 14673), (1533, 13735), (2345, 8979), (2555, 8241), (2747, 7665), (2993, 7035), (4305, 4891)]