20987265

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{487}}^1$

素因数の和:538

約数の個数: 48

約数和(自身を含む): 38579328

約数和(自身を除く): 17592063

約数列:

[1, 3, 5, 13, 15, 17, 39, 51, 65, 85, 169, 195, 221, 255, 487, 507, 663, 845, 1105, 1461, 2435, 2535, 2873, 3315, 6331, 7305, 8279, 8619, 14365, 18993, 24837, 31655, 41395, 43095, 82303, 94965, 107627, 124185, 246909, 322881, 411515, 538135, 1234545, 1399151, 1614405, 4197453, 6995755, 20987265]

約数ペア:

[(1, 20987265), (3, 6995755), (5, 4197453), (13, 1614405), (15, 1399151), (17, 1234545), (39, 538135), (51, 411515), (65, 322881), (85, 246909), (169, 124185), (195, 107627), (221, 94965), (255, 82303), (487, 43095), (507, 41395), (663, 31655), (845, 24837), (1105, 18993), (1461, 14365), (2435, 8619), (2535, 8279), (2873, 7305), (3315, 6331)]