21578661

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{571}}^1$

素因数の和:626

約数の個数: 48

約数和(自身を含む): 37477440

約数和(自身を除く): 15898779

約数列:

[1, 3, 9, 13, 17, 19, 39, 51, 57, 117, 153, 171, 221, 247, 323, 571, 663, 741, 969, 1713, 1989, 2223, 2907, 4199, 5139, 7423, 9707, 10849, 12597, 22269, 29121, 32547, 37791, 66807, 87363, 97641, 126191, 141037, 184433, 378573, 423111, 553299, 1135719, 1269333, 1659897, 2397629, 7192887, 21578661]

約数ペア:

[(1, 21578661), (3, 7192887), (9, 2397629), (13, 1659897), (17, 1269333), (19, 1135719), (39, 553299), (51, 423111), (57, 378573), (117, 184433), (153, 141037), (171, 126191), (221, 97641), (247, 87363), (323, 66807), (571, 37791), (663, 32547), (741, 29121), (969, 22269), (1713, 12597), (1989, 10849), (2223, 9707), (2907, 7423), (4199, 5139)]