21439975

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{827}}^1$

素因数の和:915

約数の個数: 24

約数和(自身を含む): 28645488

約数和(自身を除く): 7205513

約数列:

[1, 5, 17, 25, 61, 85, 305, 425, 827, 1037, 1525, 4135, 5185, 14059, 20675, 25925, 50447, 70295, 252235, 351475, 857599, 1261175, 4287995, 21439975]

約数ペア:

[(1, 21439975), (5, 4287995), (17, 1261175), (25, 857599), (61, 351475), (85, 252235), (305, 70295), (425, 50447), (827, 25925), (1037, 20675), (1525, 14059), (4135, 5185)]