21656895

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1$

素因数の和:224

約数の個数: 64

約数和(自身を含む): 40642560

約数和(自身を除く): 18985665

約数列:

[1, 3, 5, 13, 15, 17, 39, 47, 51, 65, 85, 139, 141, 195, 221, 235, 255, 417, 611, 663, 695, 705, 799, 1105, 1807, 1833, 2085, 2363, 2397, 3055, 3315, 3995, 5421, 6533, 7089, 9035, 9165, 10387, 11815, 11985, 19599, 27105, 30719, 31161, 32665, 35445, 51935, 84929, 92157, 97995, 111061, 153595, 155805, 254787, 333183, 424645, 460785, 555305, 1273935, 1443793, 1665915, 4331379, 7218965, 21656895]

約数ペア:

[(1, 21656895), (3, 7218965), (5, 4331379), (13, 1665915), (15, 1443793), (17, 1273935), (39, 555305), (47, 460785), (51, 424645), (65, 333183), (85, 254787), (139, 155805), (141, 153595), (195, 111061), (221, 97995), (235, 92157), (255, 84929), (417, 51935), (611, 35445), (663, 32665), (695, 31161), (705, 30719), (799, 27105), (1105, 19599), (1807, 11985), (1833, 11815), (2085, 10387), (2363, 9165), (2397, 9035), (3055, 7089), (3315, 6533), (3995, 5421)]