20991795

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{107}}^1$

素因数の和:196

約数の個数: 64

約数和(自身を含む): 39191040

約数和(自身を除く): 18199245

約数列:

[1, 3, 5, 11, 15, 29, 33, 41, 55, 87, 107, 123, 145, 165, 205, 319, 321, 435, 451, 535, 615, 957, 1177, 1189, 1353, 1595, 1605, 2255, 3103, 3531, 3567, 4387, 4785, 5885, 5945, 6765, 9309, 13079, 13161, 15515, 17655, 17835, 21935, 34133, 39237, 46545, 48257, 65395, 65805, 102399, 127223, 144771, 170665, 196185, 241285, 381669, 511995, 636115, 723855, 1399453, 1908345, 4198359, 6997265, 20991795]

約数ペア:

[(1, 20991795), (3, 6997265), (5, 4198359), (11, 1908345), (15, 1399453), (29, 723855), (33, 636115), (41, 511995), (55, 381669), (87, 241285), (107, 196185), (123, 170665), (145, 144771), (165, 127223), (205, 102399), (319, 65805), (321, 65395), (435, 48257), (451, 46545), (535, 39237), (615, 34133), (957, 21935), (1177, 17835), (1189, 17655), (1353, 15515), (1595, 13161), (1605, 13079), (2255, 9309), (3103, 6765), (3531, 5945), (3567, 5885), (4387, 4785)]