21056285

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:245

約数の個数: 32

約数和(自身を含む): 28283904

約数和(自身を除く): 7227619

約数列:

[1, 5, 17, 31, 61, 85, 131, 155, 305, 527, 655, 1037, 1891, 2227, 2635, 4061, 5185, 7991, 9455, 11135, 20305, 32147, 39955, 69037, 135847, 160735, 247721, 345185, 679235, 1238605, 4211257, 21056285]

約数ペア:

[(1, 21056285), (5, 4211257), (17, 1238605), (31, 679235), (61, 345185), (85, 247721), (131, 160735), (155, 135847), (305, 69037), (527, 39955), (655, 32147), (1037, 20305), (1891, 11135), (2227, 9455), (2635, 7991), (4061, 5185)]