20661280

素因数分解:

$2^5\times 5^1\times {\mathrm{263}}^1\times {\mathrm{491}}^1$

素因数の和:769

約数の個数: 48

約数和(自身を含む): 49097664

約数和(自身を除く): 28436384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 263, 491, 526, 982, 1052, 1315, 1964, 2104, 2455, 2630, 3928, 4208, 4910, 5260, 7856, 8416, 9820, 10520, 15712, 19640, 21040, 39280, 42080, 78560, 129133, 258266, 516532, 645665, 1033064, 1291330, 2066128, 2582660, 4132256, 5165320, 10330640, 20661280]

約数ペア:

[(1, 20661280), (2, 10330640), (4, 5165320), (5, 4132256), (8, 2582660), (10, 2066128), (16, 1291330), (20, 1033064), (32, 645665), (40, 516532), (80, 258266), (160, 129133), (263, 78560), (491, 42080), (526, 39280), (982, 21040), (1052, 19640), (1315, 15712), (1964, 10520), (2104, 9820), (2455, 8416), (2630, 7856), (3928, 5260), (4208, 4910)]