21000000175

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{277}}^1\times {\mathrm{39383}}^1$

素因数の和:39688

約数の個数: 48

約数和(自身を含む): 32583485952

約数和(自身を除く): 11583485777

約数列:

[1, 5, 7, 11, 25, 35, 55, 77, 175, 275, 277, 385, 1385, 1925, 1939, 3047, 6925, 9695, 15235, 21329, 39383, 48475, 76175, 106645, 196915, 275681, 433213, 533225, 984575, 1378405, 2166065, 3032491, 6892025, 10830325, 10909091, 15162455, 54545455, 75812275, 76363637, 120000001, 272727275, 381818185, 600000005, 840000007, 1909090925, 3000000025, 4200000035, 21000000175]

約数ペア:

[(1, 21000000175), (5, 4200000035), (7, 3000000025), (11, 1909090925), (25, 840000007), (35, 600000005), (55, 381818185), (77, 272727275), (175, 120000001), (275, 76363637), (277, 75812275), (385, 54545455), (1385, 15162455), (1925, 10909091), (1939, 10830325), (3047, 6892025), (6925, 3032491), (9695, 2166065), (15235, 1378405), (21329, 984575), (39383, 533225), (48475, 433213), (76175, 275681), (106645, 196915)]