21978801

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{9887}}^1$

素因数の和:9925

約数の個数: 24

約数和(自身を含む): 35992320

約数和(自身を除く): 14013519

約数列:

[1, 3, 9, 13, 19, 39, 57, 117, 171, 247, 741, 2223, 9887, 29661, 88983, 128531, 187853, 385593, 563559, 1156779, 1690677, 2442089, 7326267, 21978801]

約数ペア:

[(1, 21978801), (3, 7326267), (9, 2442089), (13, 1690677), (19, 1156779), (39, 563559), (57, 385593), (117, 187853), (171, 128531), (247, 88983), (741, 29661), (2223, 9887)]