20729995

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{367}}^1$

素因数の和:475

約数の個数: 32

約数和(自身を含む): 29675520

約数和(自身を除く): 8945525

約数列:

[1, 5, 11, 13, 55, 65, 79, 143, 367, 395, 715, 869, 1027, 1835, 4037, 4345, 4771, 5135, 11297, 20185, 23855, 28993, 52481, 56485, 144965, 262405, 318923, 376909, 1594615, 1884545, 4145999, 20729995]

約数ペア:

[(1, 20729995), (5, 4145999), (11, 1884545), (13, 1594615), (55, 376909), (65, 318923), (79, 262405), (143, 144965), (367, 56485), (395, 52481), (715, 28993), (869, 23855), (1027, 20185), (1835, 11297), (4037, 5135), (4345, 4771)]