20387871

素因数分解:

$3^2\times 7^2\times {\mathrm{83}}^1\times {\mathrm{557}}^1$

素因数の和:660

約数の個数: 36

約数和(自身を含む): 34732152

約数和(自身を除く): 14344281

約数列:

[1, 3, 7, 9, 21, 49, 63, 83, 147, 249, 441, 557, 581, 747, 1671, 1743, 3899, 4067, 5013, 5229, 11697, 12201, 27293, 35091, 36603, 46231, 81879, 138693, 245637, 323617, 416079, 970851, 2265319, 2912553, 6795957, 20387871]

約数ペア:

[(1, 20387871), (3, 6795957), (7, 2912553), (9, 2265319), (21, 970851), (49, 416079), (63, 323617), (83, 245637), (147, 138693), (249, 81879), (441, 46231), (557, 36603), (581, 35091), (747, 27293), (1671, 12201), (1743, 11697), (3899, 5229), (4067, 5013)]