21209925

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{547}}^1$

素因数の和:618

約数の個数: 48

約数和(自身を含む): 39140352

約数和(自身を除く): 17930427

約数列:

[1, 3, 5, 11, 15, 25, 33, 47, 55, 75, 141, 165, 235, 275, 517, 547, 705, 825, 1175, 1551, 1641, 2585, 2735, 3525, 6017, 7755, 8205, 12925, 13675, 18051, 25709, 30085, 38775, 41025, 77127, 90255, 128545, 150425, 282799, 385635, 451275, 642725, 848397, 1413995, 1928175, 4241985, 7069975, 21209925]

約数ペア:

[(1, 21209925), (3, 7069975), (5, 4241985), (11, 1928175), (15, 1413995), (25, 848397), (33, 642725), (47, 451275), (55, 385635), (75, 282799), (141, 150425), (165, 128545), (235, 90255), (275, 77127), (517, 41025), (547, 38775), (705, 30085), (825, 25709), (1175, 18051), (1551, 13675), (1641, 12925), (2585, 8205), (2735, 7755), (3525, 6017)]