20690516

素因数分解:

$2^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{197}}^1$

素因数の和:261

約数の個数: 72

約数和(自身を含む): 47190528

約数和(自身を除く): 26500012

約数列:

[1, 2, 4, 7, 11, 14, 22, 28, 31, 44, 62, 77, 121, 124, 154, 197, 217, 242, 308, 341, 394, 434, 484, 682, 788, 847, 868, 1364, 1379, 1694, 2167, 2387, 2758, 3388, 3751, 4334, 4774, 5516, 6107, 7502, 8668, 9548, 12214, 15004, 15169, 23837, 24428, 26257, 30338, 42749, 47674, 52514, 60676, 67177, 85498, 95348, 105028, 134354, 166859, 170996, 268708, 333718, 470239, 667436, 738947, 940478, 1477894, 1880956, 2955788, 5172629, 10345258, 20690516]

約数ペア:

[(1, 20690516), (2, 10345258), (4, 5172629), (7, 2955788), (11, 1880956), (14, 1477894), (22, 940478), (28, 738947), (31, 667436), (44, 470239), (62, 333718), (77, 268708), (121, 170996), (124, 166859), (154, 134354), (197, 105028), (217, 95348), (242, 85498), (308, 67177), (341, 60676), (394, 52514), (434, 47674), (484, 42749), (682, 30338), (788, 26257), (847, 24428), (868, 23837), (1364, 15169), (1379, 15004), (1694, 12214), (2167, 9548), (2387, 8668), (2758, 7502), (3388, 6107), (3751, 5516), (4334, 4774)]