21139923

素因数分解:

$3^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{4639}}^1$

素因数の和:4687

約数の個数: 24

約数和(自身を含む): 33853440

約数和(自身を除く): 12713517

約数列:

[1, 3, 7, 21, 31, 49, 93, 147, 217, 651, 1519, 4557, 4639, 13917, 32473, 97419, 143809, 227311, 431427, 681933, 1006663, 3019989, 7046641, 21139923]

約数ペア:

[(1, 21139923), (3, 7046641), (7, 3019989), (21, 1006663), (31, 681933), (49, 431427), (93, 227311), (147, 143809), (217, 97419), (651, 32473), (1519, 13917), (4557, 4639)]