20987415

素因数分解:

$3^2\times 5^1\times {\mathrm{67}}^1\times {\mathrm{6961}}^1$

素因数の和:7039

約数の個数: 24

約数和(自身を含む): 36926448

約数和(自身を除く): 15939033

約数列:

[1, 3, 5, 9, 15, 45, 67, 201, 335, 603, 1005, 3015, 6961, 20883, 34805, 62649, 104415, 313245, 466387, 1399161, 2331935, 4197483, 6995805, 20987415]

約数ペア:

[(1, 20987415), (3, 6995805), (5, 4197483), (9, 2331935), (15, 1399161), (45, 466387), (67, 313245), (201, 104415), (335, 62649), (603, 34805), (1005, 20883), (3015, 6961)]