18821390

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{541}}^1$

素因数の和:633

約数の個数: 48

約数和(自身を含む): 40038624

約数和(自身を除く): 21217234

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 71, 98, 142, 245, 355, 490, 497, 541, 710, 994, 1082, 2485, 2705, 3479, 3787, 4970, 5410, 6958, 7574, 17395, 18935, 26509, 34790, 37870, 38411, 53018, 76822, 132545, 192055, 265090, 268877, 384110, 537754, 1344385, 1882139, 2688770, 3764278, 9410695, 18821390]

約数ペア:

[(1, 18821390), (2, 9410695), (5, 3764278), (7, 2688770), (10, 1882139), (14, 1344385), (35, 537754), (49, 384110), (70, 268877), (71, 265090), (98, 192055), (142, 132545), (245, 76822), (355, 53018), (490, 38411), (497, 37870), (541, 34790), (710, 26509), (994, 18935), (1082, 17395), (2485, 7574), (2705, 6958), (3479, 5410), (3787, 4970)]