128217920

素因数分解:

$2^6\times 5^1\times {\mathrm{400681}}^1$

素因数の和:400698

約数の個数: 28

約数和(自身を含む): 305319684

約数和(自身を除く): 177101764

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 400681, 801362, 1602724, 2003405, 3205448, 4006810, 6410896, 8013620, 12821792, 16027240, 25643584, 32054480, 64108960, 128217920]

約数ペア:

[(1, 128217920), (2, 64108960), (4, 32054480), (5, 25643584), (8, 16027240), (10, 12821792), (16, 8013620), (20, 6410896), (32, 4006810), (40, 3205448), (64, 2003405), (80, 1602724), (160, 801362), (320, 400681)]