21051280

素因数分解:

$2^4\times 5^1\times {\mathrm{271}}^1\times {\mathrm{971}}^1$

素因数の和:1255

約数の個数: 40

約数和(自身を含む): 49175424

約数和(自身を除く): 28124144

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 271, 542, 971, 1084, 1355, 1942, 2168, 2710, 3884, 4336, 4855, 5420, 7768, 9710, 10840, 15536, 19420, 21680, 38840, 77680, 263141, 526282, 1052564, 1315705, 2105128, 2631410, 4210256, 5262820, 10525640, 21051280]

約数ペア:

[(1, 21051280), (2, 10525640), (4, 5262820), (5, 4210256), (8, 2631410), (10, 2105128), (16, 1315705), (20, 1052564), (40, 526282), (80, 263141), (271, 77680), (542, 38840), (971, 21680), (1084, 19420), (1355, 15536), (1942, 10840), (2168, 9710), (2710, 7768), (3884, 5420), (4336, 4855)]