20818161

素因数分解:

$3^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{229}}^1$

素因数の和:295

約数の個数: 64

約数和(自身を含む): 39155200

約数和(自身を除く): 18337039

約数列:

[1, 3, 7, 9, 13, 21, 27, 37, 39, 63, 91, 111, 117, 189, 229, 259, 273, 333, 351, 481, 687, 777, 819, 999, 1443, 1603, 2061, 2331, 2457, 2977, 3367, 4329, 4809, 6183, 6993, 8473, 8931, 10101, 12987, 14427, 20839, 25419, 26793, 30303, 43281, 59311, 62517, 76257, 80379, 90909, 110149, 177933, 187551, 228771, 330447, 533799, 562653, 771043, 991341, 1601397, 2313129, 2974023, 6939387, 20818161]

約数ペア:

[(1, 20818161), (3, 6939387), (7, 2974023), (9, 2313129), (13, 1601397), (21, 991341), (27, 771043), (37, 562653), (39, 533799), (63, 330447), (91, 228771), (111, 187551), (117, 177933), (189, 110149), (229, 90909), (259, 80379), (273, 76257), (333, 62517), (351, 59311), (481, 43281), (687, 30303), (777, 26793), (819, 25419), (999, 20839), (1443, 14427), (1603, 12987), (2061, 10101), (2331, 8931), (2457, 8473), (2977, 6993), (3367, 6183), (4329, 4809)]