21280356

素因数分解:

$2^2\times 3^2\times {\mathrm{43}}^1\times {\mathrm{59}}^1\times {\mathrm{233}}^1$

素因数の和:345

約数の個数: 72

約数和(自身を含む): 56216160

約数和(自身を除く): 34935804

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 43, 59, 86, 118, 129, 172, 177, 233, 236, 258, 354, 387, 466, 516, 531, 699, 708, 774, 932, 1062, 1398, 1548, 2097, 2124, 2537, 2796, 4194, 5074, 7611, 8388, 10019, 10148, 13747, 15222, 20038, 22833, 27494, 30057, 30444, 40076, 41241, 45666, 54988, 60114, 82482, 90171, 91332, 120228, 123723, 164964, 180342, 247446, 360684, 494892, 591121, 1182242, 1773363, 2364484, 3546726, 5320089, 7093452, 10640178, 21280356]

約数ペア:

[(1, 21280356), (2, 10640178), (3, 7093452), (4, 5320089), (6, 3546726), (9, 2364484), (12, 1773363), (18, 1182242), (36, 591121), (43, 494892), (59, 360684), (86, 247446), (118, 180342), (129, 164964), (172, 123723), (177, 120228), (233, 91332), (236, 90171), (258, 82482), (354, 60114), (387, 54988), (466, 45666), (516, 41241), (531, 40076), (699, 30444), (708, 30057), (774, 27494), (932, 22833), (1062, 20038), (1398, 15222), (1548, 13747), (2097, 10148), (2124, 10019), (2537, 8388), (2796, 7611), (4194, 5074)]