21820075

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{647}}^1$

素因数の和:747

約数の個数: 24

約数和(自身を含む): 28926720

約数和(自身を除く): 7106645

約数列:

[1, 5, 19, 25, 71, 95, 355, 475, 647, 1349, 1775, 3235, 6745, 12293, 16175, 33725, 45937, 61465, 229685, 307325, 872803, 1148425, 4364015, 21820075]

約数ペア:

[(1, 21820075), (5, 4364015), (19, 1148425), (25, 872803), (71, 307325), (95, 229685), (355, 61465), (475, 45937), (647, 33725), (1349, 16175), (1775, 12293), (3235, 6745)]