20393440

素因数分解:

$2^5\times 5^1\times {\mathrm{197}}^1\times {\mathrm{647}}^1$

素因数の和:859

約数の個数: 48

約数和(自身を含む): 48498912

約数和(自身を除く): 28105472

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 197, 394, 647, 788, 985, 1294, 1576, 1970, 2588, 3152, 3235, 3940, 5176, 6304, 6470, 7880, 10352, 12940, 15760, 20704, 25880, 31520, 51760, 103520, 127459, 254918, 509836, 637295, 1019672, 1274590, 2039344, 2549180, 4078688, 5098360, 10196720, 20393440]

約数ペア:

[(1, 20393440), (2, 10196720), (4, 5098360), (5, 4078688), (8, 2549180), (10, 2039344), (16, 1274590), (20, 1019672), (32, 637295), (40, 509836), (80, 254918), (160, 127459), (197, 103520), (394, 51760), (647, 31520), (788, 25880), (985, 20704), (1294, 15760), (1576, 12940), (1970, 10352), (2588, 7880), (3152, 6470), (3235, 6304), (3940, 5176)]