21539140

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{1123}}^1$

素因数の和:1276

約数の個数: 48

約数和(自身を含む): 52117632

約数和(自身を除く): 30578492

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 137, 140, 274, 548, 685, 959, 1123, 1370, 1918, 2246, 2740, 3836, 4492, 4795, 5615, 7861, 9590, 11230, 15722, 19180, 22460, 31444, 39305, 78610, 153851, 157220, 307702, 615404, 769255, 1076957, 1538510, 2153914, 3077020, 4307828, 5384785, 10769570, 21539140]

約数ペア:

[(1, 21539140), (2, 10769570), (4, 5384785), (5, 4307828), (7, 3077020), (10, 2153914), (14, 1538510), (20, 1076957), (28, 769255), (35, 615404), (70, 307702), (137, 157220), (140, 153851), (274, 78610), (548, 39305), (685, 31444), (959, 22460), (1123, 19180), (1370, 15722), (1918, 11230), (2246, 9590), (2740, 7861), (3836, 5615), (4492, 4795)]