20915780

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{227}}^1\times {\mathrm{271}}^1$

素因数の和:524

約数の個数: 48

約数和(自身を含む): 46884096

約数和(自身を除く): 25968316

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 227, 271, 340, 454, 542, 908, 1084, 1135, 1355, 2270, 2710, 3859, 4540, 4607, 5420, 7718, 9214, 15436, 18428, 19295, 23035, 38590, 46070, 61517, 77180, 92140, 123034, 246068, 307585, 615170, 1045789, 1230340, 2091578, 4183156, 5228945, 10457890, 20915780]

約数ペア:

[(1, 20915780), (2, 10457890), (4, 5228945), (5, 4183156), (10, 2091578), (17, 1230340), (20, 1045789), (34, 615170), (68, 307585), (85, 246068), (170, 123034), (227, 92140), (271, 77180), (340, 61517), (454, 46070), (542, 38590), (908, 23035), (1084, 19295), (1135, 18428), (1355, 15436), (2270, 9214), (2710, 7718), (3859, 5420), (4540, 4607)]