20314640

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1289}}^1$

素因数の和:1499

約数の個数: 40

約数和(自身を含む): 47508120

約数和(自身を除く): 27193480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1289, 1576, 1970, 2578, 3152, 3940, 5156, 6445, 7880, 10312, 12890, 15760, 20624, 25780, 51560, 103120, 253933, 507866, 1015732, 1269665, 2031464, 2539330, 4062928, 5078660, 10157320, 20314640]

約数ペア:

[(1, 20314640), (2, 10157320), (4, 5078660), (5, 4062928), (8, 2539330), (10, 2031464), (16, 1269665), (20, 1015732), (40, 507866), (80, 253933), (197, 103120), (394, 51560), (788, 25780), (985, 20624), (1289, 15760), (1576, 12890), (1970, 10312), (2578, 7880), (3152, 6445), (3940, 5156)]