21509675

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{107}}^1$

素因数の和:188

約数の個数: 48

約数和(自身を含む): 31819392

約数和(自身を除く): 10309717

約数列:

[1, 5, 11, 17, 25, 43, 55, 85, 107, 187, 215, 275, 425, 473, 535, 731, 935, 1075, 1177, 1819, 2365, 2675, 3655, 4601, 4675, 5885, 8041, 9095, 11825, 18275, 20009, 23005, 29425, 40205, 45475, 50611, 78217, 100045, 115025, 201025, 253055, 391085, 500225, 860387, 1265275, 1955425, 4301935, 21509675]

約数ペア:

[(1, 21509675), (5, 4301935), (11, 1955425), (17, 1265275), (25, 860387), (43, 500225), (55, 391085), (85, 253055), (107, 201025), (187, 115025), (215, 100045), (275, 78217), (425, 50611), (473, 45475), (535, 40205), (731, 29425), (935, 23005), (1075, 20009), (1177, 18275), (1819, 11825), (2365, 9095), (2675, 8041), (3655, 5885), (4601, 4675)]