20667280

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6301}}^1$

素因数の和:6355

約数の個数: 40

約数和(自身を含む): 49231224

約数和(自身を除く): 28563944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6301, 12602, 25204, 31505, 50408, 63010, 100816, 126020, 252040, 258341, 504080, 516682, 1033364, 1291705, 2066728, 2583410, 4133456, 5166820, 10333640, 20667280]

約数ペア:

[(1, 20667280), (2, 10333640), (4, 5166820), (5, 4133456), (8, 2583410), (10, 2066728), (16, 1291705), (20, 1033364), (40, 516682), (41, 504080), (80, 258341), (82, 252040), (164, 126020), (205, 100816), (328, 63010), (410, 50408), (656, 31505), (820, 25204), (1640, 12602), (3280, 6301)]