20998971

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{331}}^1$

素因数の和:416

約数の個数: 48

約数和(自身を含む): 37290240

約数和(自身を除く): 16291269

約数列:

[1, 3, 7, 9, 19, 21, 53, 57, 63, 133, 159, 171, 331, 371, 399, 477, 993, 1007, 1113, 1197, 2317, 2979, 3021, 3339, 6289, 6951, 7049, 9063, 17543, 18867, 20853, 21147, 44023, 52629, 56601, 63441, 122801, 132069, 157887, 333317, 368403, 396207, 999951, 1105209, 2333219, 2999853, 6999657, 20998971]

約数ペア:

[(1, 20998971), (3, 6999657), (7, 2999853), (9, 2333219), (19, 1105209), (21, 999951), (53, 396207), (57, 368403), (63, 333317), (133, 157887), (159, 132069), (171, 122801), (331, 63441), (371, 56601), (399, 52629), (477, 44023), (993, 21147), (1007, 20853), (1113, 18867), (1197, 17543), (2317, 9063), (2979, 7049), (3021, 6951), (3339, 6289)]