20994405

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^2\times {\mathrm{29}}^1\times {\mathrm{167}}^1$

素因数の和:238

約数の個数: 48

約数和(自身を含む): 37134720

約数和(自身を除く): 16140315

約数列:

[1, 3, 5, 15, 17, 29, 51, 85, 87, 145, 167, 255, 289, 435, 493, 501, 835, 867, 1445, 1479, 2465, 2505, 2839, 4335, 4843, 7395, 8381, 8517, 14195, 14529, 24215, 25143, 41905, 42585, 48263, 72645, 82331, 125715, 144789, 241315, 246993, 411655, 723945, 1234965, 1399627, 4198881, 6998135, 20994405]

約数ペア:

[(1, 20994405), (3, 6998135), (5, 4198881), (15, 1399627), (17, 1234965), (29, 723945), (51, 411655), (85, 246993), (87, 241315), (145, 144789), (167, 125715), (255, 82331), (289, 72645), (435, 48263), (493, 42585), (501, 41905), (835, 25143), (867, 24215), (1445, 14529), (1479, 14195), (2465, 8517), (2505, 8381), (2839, 7395), (4335, 4843)]