21000728

素因数分解:

$2^3\times 7^1\times {\mathrm{47}}^1\times {\mathrm{79}}^1\times {\mathrm{101}}^1$

素因数の和:240

約数の個数: 64

約数和(自身を含む): 47001600

約数和(自身を除く): 26000872

約数列:

[1, 2, 4, 7, 8, 14, 28, 47, 56, 79, 94, 101, 158, 188, 202, 316, 329, 376, 404, 553, 632, 658, 707, 808, 1106, 1316, 1414, 2212, 2632, 2828, 3713, 4424, 4747, 5656, 7426, 7979, 9494, 14852, 15958, 18988, 25991, 29704, 31916, 33229, 37976, 51982, 55853, 63832, 66458, 103964, 111706, 132916, 207928, 223412, 265832, 375013, 446824, 750026, 1500052, 2625091, 3000104, 5250182, 10500364, 21000728]

約数ペア:

[(1, 21000728), (2, 10500364), (4, 5250182), (7, 3000104), (8, 2625091), (14, 1500052), (28, 750026), (47, 446824), (56, 375013), (79, 265832), (94, 223412), (101, 207928), (158, 132916), (188, 111706), (202, 103964), (316, 66458), (329, 63832), (376, 55853), (404, 51982), (553, 37976), (632, 33229), (658, 31916), (707, 29704), (808, 25991), (1106, 18988), (1316, 15958), (1414, 14852), (2212, 9494), (2632, 7979), (2828, 7426), (3713, 5656), (4424, 4747)]