21391559

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{2683}}^1$

素因数の和:2774

約数の個数: 16

約数和(自身を含む): 26281728

約数和(自身を除く): 4890169

約数列:

[1, 7, 17, 67, 119, 469, 1139, 2683, 7973, 18781, 45611, 179761, 319277, 1258327, 3055937, 21391559]

約数ペア:

[(1, 21391559), (7, 3055937), (17, 1258327), (67, 319277), (119, 179761), (469, 45611), (1139, 18781), (2683, 7973)]