20441780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{97}}^1\times {\mathrm{257}}^1$

素因数の和:404

約数の個数: 48

約数和(自身を含む): 44600976

約数和(自身を除く): 24159196

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 97, 164, 194, 205, 257, 388, 410, 485, 514, 820, 970, 1028, 1285, 1940, 2570, 3977, 5140, 7954, 10537, 15908, 19885, 21074, 24929, 39770, 42148, 49858, 52685, 79540, 99716, 105370, 124645, 210740, 249290, 498580, 1022089, 2044178, 4088356, 5110445, 10220890, 20441780]

約数ペア:

[(1, 20441780), (2, 10220890), (4, 5110445), (5, 4088356), (10, 2044178), (20, 1022089), (41, 498580), (82, 249290), (97, 210740), (164, 124645), (194, 105370), (205, 99716), (257, 79540), (388, 52685), (410, 49858), (485, 42148), (514, 39770), (820, 24929), (970, 21074), (1028, 19885), (1285, 15908), (1940, 10537), (2570, 7954), (3977, 5140)]