21238525

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{59}}^1$

素因数の和:115

約数の個数: 72

約数和(自身を含む): 35622720

約数和(自身を除く): 14384195

約数列:

[1, 5, 7, 11, 17, 25, 35, 55, 59, 77, 85, 119, 121, 175, 187, 275, 295, 385, 413, 425, 595, 605, 649, 847, 935, 1003, 1309, 1475, 1925, 2057, 2065, 2975, 3025, 3245, 4235, 4543, 4675, 5015, 6545, 7021, 7139, 10285, 10325, 11033, 14399, 16225, 21175, 22715, 25075, 32725, 35105, 35695, 49973, 51425, 55165, 71995, 77231, 113575, 121363, 175525, 178475, 249865, 275825, 359975, 386155, 606815, 849541, 1249325, 1930775, 3034075, 4247705, 21238525]

約数ペア:

[(1, 21238525), (5, 4247705), (7, 3034075), (11, 1930775), (17, 1249325), (25, 849541), (35, 606815), (55, 386155), (59, 359975), (77, 275825), (85, 249865), (119, 178475), (121, 175525), (175, 121363), (187, 113575), (275, 77231), (295, 71995), (385, 55165), (413, 51425), (425, 49973), (595, 35695), (605, 35105), (649, 32725), (847, 25075), (935, 22715), (1003, 21175), (1309, 16225), (1475, 14399), (1925, 11033), (2057, 10325), (2065, 10285), (2975, 7139), (3025, 7021), (3245, 6545), (4235, 5015), (4543, 4675)]