20812880

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{67}}^1\times {\mathrm{353}}^1$

素因数の和:444

約数の個数: 80

約数和(自身を含む): 53728704

約数和(自身を除く): 32915824

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 67, 80, 88, 110, 134, 176, 220, 268, 335, 353, 440, 536, 670, 706, 737, 880, 1072, 1340, 1412, 1474, 1765, 2680, 2824, 2948, 3530, 3685, 3883, 5360, 5648, 5896, 7060, 7370, 7766, 11792, 14120, 14740, 15532, 19415, 23651, 28240, 29480, 31064, 38830, 47302, 58960, 62128, 77660, 94604, 118255, 155320, 189208, 236510, 260161, 310640, 378416, 473020, 520322, 946040, 1040644, 1300805, 1892080, 2081288, 2601610, 4162576, 5203220, 10406440, 20812880]

約数ペア:

[(1, 20812880), (2, 10406440), (4, 5203220), (5, 4162576), (8, 2601610), (10, 2081288), (11, 1892080), (16, 1300805), (20, 1040644), (22, 946040), (40, 520322), (44, 473020), (55, 378416), (67, 310640), (80, 260161), (88, 236510), (110, 189208), (134, 155320), (176, 118255), (220, 94604), (268, 77660), (335, 62128), (353, 58960), (440, 47302), (536, 38830), (670, 31064), (706, 29480), (737, 28240), (880, 23651), (1072, 19415), (1340, 15532), (1412, 14740), (1474, 14120), (1765, 11792), (2680, 7766), (2824, 7370), (2948, 7060), (3530, 5896), (3685, 5648), (3883, 5360)]