18521721

素因数分解:

$3^2\times {\mathrm{17}}^2\times {\mathrm{7121}}^1$

素因数の和:7161

約数の個数: 18

約数和(自身を含む): 28423902

約数和(自身を除く): 9902181

約数列:

[1, 3, 9, 17, 51, 153, 289, 867, 2601, 7121, 21363, 64089, 121057, 363171, 1089513, 2057969, 6173907, 18521721]

約数ペア:

[(1, 18521721), (3, 6173907), (9, 2057969), (17, 1089513), (51, 363171), (153, 121057), (289, 64089), (867, 21363), (2601, 7121)]