21294980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{4111}}^1$

素因数の和:4164

約数の個数: 48

約数和(自身を含む): 52502016

約数和(自身を除く): 31207036

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 37, 70, 74, 140, 148, 185, 259, 370, 518, 740, 1036, 1295, 2590, 4111, 5180, 8222, 16444, 20555, 28777, 41110, 57554, 82220, 115108, 143885, 152107, 287770, 304214, 575540, 608428, 760535, 1064749, 1521070, 2129498, 3042140, 4258996, 5323745, 10647490, 21294980]

約数ペア:

[(1, 21294980), (2, 10647490), (4, 5323745), (5, 4258996), (7, 3042140), (10, 2129498), (14, 1521070), (20, 1064749), (28, 760535), (35, 608428), (37, 575540), (70, 304214), (74, 287770), (140, 152107), (148, 143885), (185, 115108), (259, 82220), (370, 57554), (518, 41110), (740, 28777), (1036, 20555), (1295, 16444), (2590, 8222), (4111, 5180)]