20947815

素因数分解:

$3^6\times 5^1\times 7^1\times {\mathrm{821}}^1$

素因数の和:851

約数の個数: 56

約数和(自身を含む): 43125408

約数和(自身を除く): 22177593

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 81, 105, 135, 189, 243, 315, 405, 567, 729, 821, 945, 1215, 1701, 2463, 2835, 3645, 4105, 5103, 5747, 7389, 8505, 12315, 17241, 22167, 25515, 28735, 36945, 51723, 66501, 86205, 110835, 155169, 199503, 258615, 332505, 465507, 598509, 775845, 997515, 1396521, 2327535, 2992545, 4189563, 6982605, 20947815]

約数ペア:

[(1, 20947815), (3, 6982605), (5, 4189563), (7, 2992545), (9, 2327535), (15, 1396521), (21, 997515), (27, 775845), (35, 598509), (45, 465507), (63, 332505), (81, 258615), (105, 199503), (135, 155169), (189, 110835), (243, 86205), (315, 66501), (405, 51723), (567, 36945), (729, 28735), (821, 25515), (945, 22167), (1215, 17241), (1701, 12315), (2463, 8505), (2835, 7389), (3645, 5747), (4105, 5103)]