21236480

素因数分解:

$2^8\times 5^1\times {\mathrm{47}}^1\times {\mathrm{353}}^1$

素因数の和:421

約数の個数: 72

約数和(自身を含む): 52097472

約数和(自身を除く): 30860992

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 47, 64, 80, 94, 128, 160, 188, 235, 256, 320, 353, 376, 470, 640, 706, 752, 940, 1280, 1412, 1504, 1765, 1880, 2824, 3008, 3530, 3760, 5648, 6016, 7060, 7520, 11296, 12032, 14120, 15040, 16591, 22592, 28240, 30080, 33182, 45184, 56480, 60160, 66364, 82955, 90368, 112960, 132728, 165910, 225920, 265456, 331820, 451840, 530912, 663640, 1061824, 1327280, 2123648, 2654560, 4247296, 5309120, 10618240, 21236480]

約数ペア:

[(1, 21236480), (2, 10618240), (4, 5309120), (5, 4247296), (8, 2654560), (10, 2123648), (16, 1327280), (20, 1061824), (32, 663640), (40, 530912), (47, 451840), (64, 331820), (80, 265456), (94, 225920), (128, 165910), (160, 132728), (188, 112960), (235, 90368), (256, 82955), (320, 66364), (353, 60160), (376, 56480), (470, 45184), (640, 33182), (706, 30080), (752, 28240), (940, 22592), (1280, 16591), (1412, 15040), (1504, 14120), (1765, 12032), (1880, 11296), (2824, 7520), (3008, 7060), (3530, 6016), (3760, 5648)]