21010276

素因数分解:

$2^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{541}}^1$

素因数の和:644

約数の個数: 48

約数和(自身を含む): 44920960

約数和(自身を除く): 23910684

約数列:

[1, 2, 4, 7, 14, 19, 28, 38, 73, 76, 133, 146, 266, 292, 511, 532, 541, 1022, 1082, 1387, 2044, 2164, 2774, 3787, 5548, 7574, 9709, 10279, 15148, 19418, 20558, 38836, 39493, 41116, 71953, 78986, 143906, 157972, 276451, 287812, 552902, 750367, 1105804, 1500734, 3001468, 5252569, 10505138, 21010276]

約数ペア:

[(1, 21010276), (2, 10505138), (4, 5252569), (7, 3001468), (14, 1500734), (19, 1105804), (28, 750367), (38, 552902), (73, 287812), (76, 276451), (133, 157972), (146, 143906), (266, 78986), (292, 71953), (511, 41116), (532, 39493), (541, 38836), (1022, 20558), (1082, 19418), (1387, 15148), (2044, 10279), (2164, 9709), (2774, 7574), (3787, 5548)]