20321291240

素因数分解:

$2^3\times 5^1\times {\mathrm{1289}}^1\times {\mathrm{394129}}^1$

素因数の和:395429

約数の個数: 32

約数和(自身を含む): 45758493000

約数和(自身を除く): 25437201760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1289, 2578, 5156, 6445, 10312, 12890, 25780, 51560, 394129, 788258, 1576516, 1970645, 3153032, 3941290, 7882580, 15765160, 508032281, 1016064562, 2032129124, 2540161405, 4064258248, 5080322810, 10160645620, 20321291240]

約数ペア:

[(1, 20321291240), (2, 10160645620), (4, 5080322810), (5, 4064258248), (8, 2540161405), (10, 2032129124), (20, 1016064562), (40, 508032281), (1289, 15765160), (2578, 7882580), (5156, 3941290), (6445, 3153032), (10312, 1970645), (12890, 1576516), (25780, 788258), (51560, 394129)]