20915559

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{331}}^1$

素因数の和:420

約数の個数: 48

約数和(自身を含む): 37290240

約数和(自身を除く): 16374681

約数列:

[1, 3, 7, 9, 17, 21, 51, 59, 63, 119, 153, 177, 331, 357, 413, 531, 993, 1003, 1071, 1239, 2317, 2979, 3009, 3717, 5627, 6951, 7021, 9027, 16881, 19529, 20853, 21063, 39389, 50643, 58587, 63189, 118167, 136703, 175761, 331993, 354501, 410109, 995979, 1230327, 2323951, 2987937, 6971853, 20915559]

約数ペア:

[(1, 20915559), (3, 6971853), (7, 2987937), (9, 2323951), (17, 1230327), (21, 995979), (51, 410109), (59, 354501), (63, 331993), (119, 175761), (153, 136703), (177, 118167), (331, 63189), (357, 58587), (413, 50643), (531, 39389), (993, 21063), (1003, 20853), (1071, 19529), (1239, 16881), (2317, 9027), (2979, 7021), (3009, 6951), (3717, 5627)]