18647920

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{907}}^1$

素因数の和:1177

約数の個数: 40

約数和(自身を含む): 43573104

約数和(自身を除く): 24925184

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 907, 1028, 1285, 1814, 2056, 2570, 3628, 4112, 4535, 5140, 7256, 9070, 10280, 14512, 18140, 20560, 36280, 72560, 233099, 466198, 932396, 1165495, 1864792, 2330990, 3729584, 4661980, 9323960, 18647920]

約数ペア:

[(1, 18647920), (2, 9323960), (4, 4661980), (5, 3729584), (8, 2330990), (10, 1864792), (16, 1165495), (20, 932396), (40, 466198), (80, 233099), (257, 72560), (514, 36280), (907, 20560), (1028, 18140), (1285, 14512), (1814, 10280), (2056, 9070), (2570, 7256), (3628, 5140), (4112, 4535)]