21328640

素因数分解:

$2^8\times 5^1\times {\mathrm{19}}^1\times {\mathrm{877}}^1$

素因数の和:917

約数の個数: 72

約数和(自身を含む): 53838960

約数和(自身を除く): 32510320

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 32, 38, 40, 64, 76, 80, 95, 128, 152, 160, 190, 256, 304, 320, 380, 608, 640, 760, 877, 1216, 1280, 1520, 1754, 2432, 3040, 3508, 4385, 4864, 6080, 7016, 8770, 12160, 14032, 16663, 17540, 24320, 28064, 33326, 35080, 56128, 66652, 70160, 83315, 112256, 133304, 140320, 166630, 224512, 266608, 280640, 333260, 533216, 561280, 666520, 1066432, 1122560, 1333040, 2132864, 2666080, 4265728, 5332160, 10664320, 21328640]

約数ペア:

[(1, 21328640), (2, 10664320), (4, 5332160), (5, 4265728), (8, 2666080), (10, 2132864), (16, 1333040), (19, 1122560), (20, 1066432), (32, 666520), (38, 561280), (40, 533216), (64, 333260), (76, 280640), (80, 266608), (95, 224512), (128, 166630), (152, 140320), (160, 133304), (190, 112256), (256, 83315), (304, 70160), (320, 66652), (380, 56128), (608, 35080), (640, 33326), (760, 28064), (877, 24320), (1216, 17540), (1280, 16663), (1520, 14032), (1754, 12160), (2432, 8770), (3040, 7016), (3508, 6080), (4385, 4864)]