21681280

素因数分解:

$2^7\times 5^1\times {\mathrm{19}}^1\times {\mathrm{1783}}^1$

素因数の和:1821

約数の個数: 64

約数和(自身を含む): 54590400

約数和(自身を除く): 32909120

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 32, 38, 40, 64, 76, 80, 95, 128, 152, 160, 190, 304, 320, 380, 608, 640, 760, 1216, 1520, 1783, 2432, 3040, 3566, 6080, 7132, 8915, 12160, 14264, 17830, 28528, 33877, 35660, 57056, 67754, 71320, 114112, 135508, 142640, 169385, 228224, 271016, 285280, 338770, 542032, 570560, 677540, 1084064, 1141120, 1355080, 2168128, 2710160, 4336256, 5420320, 10840640, 21681280]

約数ペア:

[(1, 21681280), (2, 10840640), (4, 5420320), (5, 4336256), (8, 2710160), (10, 2168128), (16, 1355080), (19, 1141120), (20, 1084064), (32, 677540), (38, 570560), (40, 542032), (64, 338770), (76, 285280), (80, 271016), (95, 228224), (128, 169385), (152, 142640), (160, 135508), (190, 114112), (304, 71320), (320, 67754), (380, 57056), (608, 35660), (640, 33877), (760, 28528), (1216, 17830), (1520, 14264), (1783, 12160), (2432, 8915), (3040, 7132), (3566, 6080)]