19811987

素因数分解:

${\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{157}}^1\times {\mathrm{571}}^1$

素因数の和:758

約数の個数: 16

約数和(自身を含む): 22774752

約数和(自身を除く): 2962765

約数列:

[1, 13, 17, 157, 221, 571, 2041, 2669, 7423, 9707, 34697, 89647, 126191, 1165411, 1523999, 19811987]

約数ペア:

[(1, 19811987), (13, 1523999), (17, 1165411), (157, 126191), (221, 89647), (571, 34697), (2041, 9707), (2669, 7423)]