21997520

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{2099}}^1$

素因数の和:2243

約数の個数: 40

約数和(自身を含む): 51559200

約数和(自身を除く): 29561680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 2096, 2099, 2620, 4198, 5240, 8396, 10480, 10495, 16792, 20990, 33584, 41980, 83960, 167920, 274969, 549938, 1099876, 1374845, 2199752, 2749690, 4399504, 5499380, 10998760, 21997520]

約数ペア:

[(1, 21997520), (2, 10998760), (4, 5499380), (5, 4399504), (8, 2749690), (10, 2199752), (16, 1374845), (20, 1099876), (40, 549938), (80, 274969), (131, 167920), (262, 83960), (524, 41980), (655, 33584), (1048, 20990), (1310, 16792), (2096, 10495), (2099, 10480), (2620, 8396), (4198, 5240)]