21020615

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{769}}^1$

素因数の和:863

約数の個数: 32

約数和(自身を含む): 31933440

約数和(自身を除く): 10912825

約数列:

[1, 5, 7, 11, 35, 55, 71, 77, 355, 385, 497, 769, 781, 2485, 3845, 3905, 5383, 5467, 8459, 26915, 27335, 42295, 54599, 59213, 272995, 296065, 382193, 600589, 1910965, 3002945, 4204123, 21020615]

約数ペア:

[(1, 21020615), (5, 4204123), (7, 3002945), (11, 1910965), (35, 600589), (55, 382193), (71, 296065), (77, 272995), (355, 59213), (385, 54599), (497, 42295), (769, 27335), (781, 26915), (2485, 8459), (3845, 5467), (3905, 5383)]