21687351

素因数分解:

$3^1\times 7^2\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{73}}^1$

素因数の和:180

約数の個数: 48

約数和(自身を含む): 35633664

約数和(自身を除く): 13946313

約数列:

[1, 3, 7, 21, 43, 47, 49, 73, 129, 141, 147, 219, 301, 329, 511, 903, 987, 1533, 2021, 2107, 2303, 3139, 3431, 3577, 6063, 6321, 6909, 9417, 10293, 10731, 14147, 21973, 24017, 42441, 65919, 72051, 99029, 147533, 153811, 168119, 297087, 442599, 461433, 504357, 1032731, 3098193, 7229117, 21687351]

約数ペア:

[(1, 21687351), (3, 7229117), (7, 3098193), (21, 1032731), (43, 504357), (47, 461433), (49, 442599), (73, 297087), (129, 168119), (141, 153811), (147, 147533), (219, 99029), (301, 72051), (329, 65919), (511, 42441), (903, 24017), (987, 21973), (1533, 14147), (2021, 10731), (2107, 10293), (2303, 9417), (3139, 6909), (3431, 6321), (3577, 6063)]