21639317

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{73}}^1$

素因数の和:197

約数の個数: 32

約数和(自身を含む): 27620352

約数和(自身を除く): 5981035

約数列:

[1, 7, 17, 47, 53, 73, 119, 329, 371, 511, 799, 901, 1241, 2491, 3431, 3869, 5593, 6307, 8687, 17437, 24017, 27083, 42347, 58327, 65773, 181843, 296429, 408289, 460411, 1272901, 3091331, 21639317]

約数ペア:

[(1, 21639317), (7, 3091331), (17, 1272901), (47, 460411), (53, 408289), (73, 296429), (119, 181843), (329, 65773), (371, 58327), (511, 42347), (799, 27083), (901, 24017), (1241, 17437), (2491, 8687), (3431, 6307), (3869, 5593)]