398646440

素因数分解:

$2^3\times 5^1\times {\mathrm{139}}^1\times {\mathrm{71699}}^1$

素因数の和:71849

約数の個数: 32

約数和(自身を含む): 903420000

約数和(自身を除く): 504773560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 139, 278, 556, 695, 1112, 1390, 2780, 5560, 71699, 143398, 286796, 358495, 573592, 716990, 1433980, 2867960, 9966161, 19932322, 39864644, 49830805, 79729288, 99661610, 199323220, 398646440]

約数ペア:

[(1, 398646440), (2, 199323220), (4, 99661610), (5, 79729288), (8, 49830805), (10, 39864644), (20, 19932322), (40, 9966161), (139, 2867960), (278, 1433980), (556, 716990), (695, 573592), (1112, 358495), (1390, 286796), (2780, 143398), (5560, 71699)]