21867280

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4481}}^1$

素因数の和:4555

約数の個数: 40

約数和(自身を含む): 51686424

約数和(自身を除く): 29819144

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4481, 4880, 8962, 17924, 22405, 35848, 44810, 71696, 89620, 179240, 273341, 358480, 546682, 1093364, 1366705, 2186728, 2733410, 4373456, 5466820, 10933640, 21867280]

約数ペア:

[(1, 21867280), (2, 10933640), (4, 5466820), (5, 4373456), (8, 2733410), (10, 2186728), (16, 1366705), (20, 1093364), (40, 546682), (61, 358480), (80, 273341), (122, 179240), (244, 89620), (305, 71696), (488, 44810), (610, 35848), (976, 22405), (1220, 17924), (2440, 8962), (4481, 4880)]