20783920

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4259}}^1$

素因数の和:4333

約数の個数: 40

約数和(自身を含む): 49126320

約数和(自身を除く): 28342400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4259, 4880, 8518, 17036, 21295, 34072, 42590, 68144, 85180, 170360, 259799, 340720, 519598, 1039196, 1298995, 2078392, 2597990, 4156784, 5195980, 10391960, 20783920]

約数ペア:

[(1, 20783920), (2, 10391960), (4, 5195980), (5, 4156784), (8, 2597990), (10, 2078392), (16, 1298995), (20, 1039196), (40, 519598), (61, 340720), (80, 259799), (122, 170360), (244, 85180), (305, 68144), (488, 42590), (610, 34072), (976, 21295), (1220, 17036), (2440, 8518), (4259, 4880)]