261209781

素因数分解:

$3^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{2539}}^1$

素因数の和:2646

約数の個数: 48

約数和(自身を含む): 456468480

約数和(自身を除く): 195258699

約数列:

[1, 3, 7, 9, 21, 23, 63, 69, 71, 161, 207, 213, 483, 497, 639, 1449, 1491, 1633, 2539, 4473, 4899, 7617, 11431, 14697, 17773, 22851, 34293, 53319, 58397, 102879, 159957, 175191, 180269, 408779, 525573, 540807, 1226337, 1261883, 1622421, 3679011, 3785649, 4146187, 11356947, 12438561, 29023309, 37315683, 87069927, 261209781]

約数ペア:

[(1, 261209781), (3, 87069927), (7, 37315683), (9, 29023309), (21, 12438561), (23, 11356947), (63, 4146187), (69, 3785649), (71, 3679011), (161, 1622421), (207, 1261883), (213, 1226337), (483, 540807), (497, 525573), (639, 408779), (1449, 180269), (1491, 175191), (1633, 159957), (2539, 102879), (4473, 58397), (4899, 53319), (7617, 34293), (11431, 22851), (14697, 17773)]