20916975

素因数分解:

$3^1\times 5^2\times {\mathrm{29}}^1\times {\mathrm{59}}^1\times {\mathrm{163}}^1$

素因数の和:264

約数の個数: 48

約数和(自身を含む): 36604800

約数和(自身を除く): 15687825

約数列:

[1, 3, 5, 15, 25, 29, 59, 75, 87, 145, 163, 177, 295, 435, 489, 725, 815, 885, 1475, 1711, 2175, 2445, 4075, 4425, 4727, 5133, 8555, 9617, 12225, 14181, 23635, 25665, 28851, 42775, 48085, 70905, 118175, 128325, 144255, 240425, 278893, 354525, 721275, 836679, 1394465, 4183395, 6972325, 20916975]

約数ペア:

[(1, 20916975), (3, 6972325), (5, 4183395), (15, 1394465), (25, 836679), (29, 721275), (59, 354525), (75, 278893), (87, 240425), (145, 144255), (163, 128325), (177, 118175), (295, 70905), (435, 48085), (489, 42775), (725, 28851), (815, 25665), (885, 23635), (1475, 14181), (1711, 12225), (2175, 9617), (2445, 8555), (4075, 5133), (4425, 4727)]