21721427

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{739}}^1$

素因数の和:795

約数の個数: 32

約数和(自身を含む): 29836800

約数和(自身を除く): 8115373

約数列:

[1, 7, 13, 17, 19, 91, 119, 133, 221, 247, 323, 739, 1547, 1729, 2261, 4199, 5173, 9607, 12563, 14041, 29393, 67249, 87941, 98287, 163319, 182533, 238697, 1143233, 1277731, 1670879, 3103061, 21721427]

約数ペア:

[(1, 21721427), (7, 3103061), (13, 1670879), (17, 1277731), (19, 1143233), (91, 238697), (119, 182533), (133, 163319), (221, 98287), (247, 87941), (323, 67249), (739, 29393), (1547, 14041), (1729, 12563), (2261, 9607), (4199, 5173)]