20821209

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{7703}}^1$

素因数の和:7776

約数の個数: 16

約数和(自身を含む): 29953152

約数和(自身を除く): 9131943

約数列:

[1, 3, 17, 51, 53, 159, 901, 2703, 7703, 23109, 130951, 392853, 408259, 1224777, 6940403, 20821209]

約数ペア:

[(1, 20821209), (3, 6940403), (17, 1224777), (51, 408259), (53, 392853), (159, 130951), (901, 23109), (2703, 7703)]