21242980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{223}}^1\times {\mathrm{433}}^1$

素因数の和:676

約数の個数: 48

約数和(自身を含む): 48996864

約数和(自身を除く): 27753884

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 223, 433, 446, 866, 892, 1115, 1732, 2165, 2230, 2453, 4330, 4460, 4763, 4906, 8660, 9526, 9812, 12265, 19052, 23815, 24530, 47630, 49060, 95260, 96559, 193118, 386236, 482795, 965590, 1062149, 1931180, 2124298, 4248596, 5310745, 10621490, 21242980]

約数ペア:

[(1, 21242980), (2, 10621490), (4, 5310745), (5, 4248596), (10, 2124298), (11, 1931180), (20, 1062149), (22, 965590), (44, 482795), (55, 386236), (110, 193118), (220, 96559), (223, 95260), (433, 49060), (446, 47630), (866, 24530), (892, 23815), (1115, 19052), (1732, 12265), (2165, 9812), (2230, 9526), (2453, 8660), (4330, 4906), (4460, 4763)]