21939920

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6689}}^1$

素因数の和:6743

約数の個数: 40

約数和(自身を含む): 52262280

約数和(自身を除く): 30322360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6689, 13378, 26756, 33445, 53512, 66890, 107024, 133780, 267560, 274249, 535120, 548498, 1096996, 1371245, 2193992, 2742490, 4387984, 5484980, 10969960, 21939920]

約数ペア:

[(1, 21939920), (2, 10969960), (4, 5484980), (5, 4387984), (8, 2742490), (10, 2193992), (16, 1371245), (20, 1096996), (40, 548498), (41, 535120), (80, 274249), (82, 267560), (164, 133780), (205, 107024), (328, 66890), (410, 53512), (656, 33445), (820, 26756), (1640, 13378), (3280, 6689)]