638860120

素因数分解:

$2^3\times 5^1\times {\mathrm{1021}}^1\times {\mathrm{15643}}^1$

素因数の和:16675

約数の個数: 32

約数和(自身を含む): 1438935120

約数和(自身を除く): 800075000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1021, 2042, 4084, 5105, 8168, 10210, 15643, 20420, 31286, 40840, 62572, 78215, 125144, 156430, 312860, 625720, 15971503, 31943006, 63886012, 79857515, 127772024, 159715030, 319430060, 638860120]

約数ペア:

[(1, 638860120), (2, 319430060), (4, 159715030), (5, 127772024), (8, 79857515), (10, 63886012), (20, 31943006), (40, 15971503), (1021, 625720), (2042, 312860), (4084, 156430), (5105, 125144), (8168, 78215), (10210, 62572), (15643, 40840), (20420, 31286)]