21273175

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{257}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 33783552

約数和(自身を除く): 12510377

約数列:

[1, 5, 7, 11, 25, 35, 43, 55, 77, 175, 215, 257, 275, 301, 385, 473, 1075, 1285, 1505, 1799, 1925, 2365, 2827, 3311, 6425, 7525, 8995, 11051, 11825, 14135, 16555, 19789, 44975, 55255, 70675, 77357, 82775, 98945, 121561, 276275, 386785, 494725, 607805, 850927, 1933925, 3039025, 4254635, 21273175]

約数ペア:

[(1, 21273175), (5, 4254635), (7, 3039025), (11, 1933925), (25, 850927), (35, 607805), (43, 494725), (55, 386785), (77, 276275), (175, 121561), (215, 98945), (257, 82775), (275, 77357), (301, 70675), (385, 55255), (473, 44975), (1075, 19789), (1285, 16555), (1505, 14135), (1799, 11825), (1925, 11051), (2365, 8995), (2827, 7525), (3311, 6425)]