21287315

素因数分解:

$5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{269}}^1$

素因数の和:324

約数の個数: 48

約数和(自身を含む): 33242400

約数和(自身を除く): 11955085

約数列:

[1, 5, 7, 17, 19, 35, 49, 85, 95, 119, 133, 245, 269, 323, 595, 665, 833, 931, 1345, 1615, 1883, 2261, 4165, 4573, 4655, 5111, 9415, 11305, 13181, 15827, 22865, 25555, 32011, 35777, 65905, 79135, 86887, 160055, 178885, 224077, 250439, 434435, 608209, 1120385, 1252195, 3041045, 4257463, 21287315]

約数ペア:

[(1, 21287315), (5, 4257463), (7, 3041045), (17, 1252195), (19, 1120385), (35, 608209), (49, 434435), (85, 250439), (95, 224077), (119, 178885), (133, 160055), (245, 86887), (269, 79135), (323, 65905), (595, 35777), (665, 32011), (833, 25555), (931, 22865), (1345, 15827), (1615, 13181), (1883, 11305), (2261, 9415), (4165, 5111), (4573, 4655)]