20404505

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{157}}^1$

素因数の和:329

約数の個数: 32

約数和(自身を含む): 28667520

約数和(自身を除く): 8263015

約数列:

[1, 5, 11, 17, 55, 85, 139, 157, 187, 695, 785, 935, 1529, 1727, 2363, 2669, 7645, 8635, 11815, 13345, 21823, 25993, 29359, 109115, 129965, 146795, 240053, 370991, 1200265, 1854955, 4080901, 20404505]

約数ペア:

[(1, 20404505), (5, 4080901), (11, 1854955), (17, 1200265), (55, 370991), (85, 240053), (139, 146795), (157, 129965), (187, 109115), (695, 29359), (785, 25993), (935, 21823), (1529, 13345), (1727, 11815), (2363, 8635), (2669, 7645)]