21287740

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{29}}^1\times {\mathrm{127}}^1$

素因数の和:199

約数の個数: 72

約数和(自身を含む): 49512960

約数和(自身を除く): 28225220

約数列:

[1, 2, 4, 5, 10, 17, 20, 29, 34, 58, 68, 85, 116, 127, 145, 170, 254, 289, 290, 340, 493, 508, 578, 580, 635, 986, 1156, 1270, 1445, 1972, 2159, 2465, 2540, 2890, 3683, 4318, 4930, 5780, 7366, 8381, 8636, 9860, 10795, 14732, 16762, 18415, 21590, 33524, 36703, 36830, 41905, 43180, 62611, 73406, 73660, 83810, 125222, 146812, 167620, 183515, 250444, 313055, 367030, 626110, 734060, 1064387, 1252220, 2128774, 4257548, 5321935, 10643870, 21287740]

約数ペア:

[(1, 21287740), (2, 10643870), (4, 5321935), (5, 4257548), (10, 2128774), (17, 1252220), (20, 1064387), (29, 734060), (34, 626110), (58, 367030), (68, 313055), (85, 250444), (116, 183515), (127, 167620), (145, 146812), (170, 125222), (254, 83810), (289, 73660), (290, 73406), (340, 62611), (493, 43180), (508, 41905), (578, 36830), (580, 36703), (635, 33524), (986, 21590), (1156, 18415), (1270, 16762), (1445, 14732), (1972, 10795), (2159, 9860), (2465, 8636), (2540, 8381), (2890, 7366), (3683, 5780), (4318, 4930)]