21406980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{50969}}^1$

素因数の和:50988

約数の個数: 48

約数和(自身を含む): 68503680

約数和(自身を除く): 47096700

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 50969, 101938, 152907, 203876, 254845, 305814, 356783, 509690, 611628, 713566, 764535, 1019380, 1070349, 1427132, 1529070, 1783915, 2140698, 3058140, 3567830, 4281396, 5351745, 7135660, 10703490, 21406980]

約数ペア:

[(1, 21406980), (2, 10703490), (3, 7135660), (4, 5351745), (5, 4281396), (6, 3567830), (7, 3058140), (10, 2140698), (12, 1783915), (14, 1529070), (15, 1427132), (20, 1070349), (21, 1019380), (28, 764535), (30, 713566), (35, 611628), (42, 509690), (60, 356783), (70, 305814), (84, 254845), (105, 203876), (140, 152907), (210, 101938), (420, 50969)]