20784560

素因数分解:

$2^4\times 5^1\times {\mathrm{73}}^1\times {\mathrm{3559}}^1$

素因数の和:3645

約数の個数: 40

約数和(自身を含む): 48999840

約数和(自身を除く): 28215280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 73, 80, 146, 292, 365, 584, 730, 1168, 1460, 2920, 3559, 5840, 7118, 14236, 17795, 28472, 35590, 56944, 71180, 142360, 259807, 284720, 519614, 1039228, 1299035, 2078456, 2598070, 4156912, 5196140, 10392280, 20784560]

約数ペア:

[(1, 20784560), (2, 10392280), (4, 5196140), (5, 4156912), (8, 2598070), (10, 2078456), (16, 1299035), (20, 1039228), (40, 519614), (73, 284720), (80, 259807), (146, 142360), (292, 71180), (365, 56944), (584, 35590), (730, 28472), (1168, 17795), (1460, 14236), (2920, 7118), (3559, 5840)]