21065120

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^2\times {\mathrm{137}}^1$

素因数の和:214

約数の個数: 72

約数和(自身を含む): 51798852

約数和(自身を除く): 30733732

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 80, 124, 137, 155, 160, 248, 274, 310, 496, 548, 620, 685, 961, 992, 1096, 1240, 1370, 1922, 2192, 2480, 2740, 3844, 4247, 4384, 4805, 4960, 5480, 7688, 8494, 9610, 10960, 15376, 16988, 19220, 21235, 21920, 30752, 33976, 38440, 42470, 67952, 76880, 84940, 131657, 135904, 153760, 169880, 263314, 339760, 526628, 658285, 679520, 1053256, 1316570, 2106512, 2633140, 4213024, 5266280, 10532560, 21065120]

約数ペア:

[(1, 21065120), (2, 10532560), (4, 5266280), (5, 4213024), (8, 2633140), (10, 2106512), (16, 1316570), (20, 1053256), (31, 679520), (32, 658285), (40, 526628), (62, 339760), (80, 263314), (124, 169880), (137, 153760), (155, 135904), (160, 131657), (248, 84940), (274, 76880), (310, 67952), (496, 42470), (548, 38440), (620, 33976), (685, 30752), (961, 21920), (992, 21235), (1096, 19220), (1240, 16988), (1370, 15376), (1922, 10960), (2192, 9610), (2480, 8494), (2740, 7688), (3844, 5480), (4247, 4960), (4384, 4805)]