21280728

素因数分解:

$2^3\times 3^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{643}}^1$

素因数の和:856

約数の個数: 64

約数和(自身を含む): 61205760

約数和(自身を除く): 39925032

約数列:

[1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, 168, 197, 394, 591, 643, 788, 1182, 1286, 1379, 1576, 1929, 2364, 2572, 2758, 3858, 4137, 4501, 4728, 5144, 5516, 7716, 8274, 9002, 11032, 13503, 15432, 16548, 18004, 27006, 33096, 36008, 54012, 108024, 126671, 253342, 380013, 506684, 760026, 886697, 1013368, 1520052, 1773394, 2660091, 3040104, 3546788, 5320182, 7093576, 10640364, 21280728]

約数ペア:

[(1, 21280728), (2, 10640364), (3, 7093576), (4, 5320182), (6, 3546788), (7, 3040104), (8, 2660091), (12, 1773394), (14, 1520052), (21, 1013368), (24, 886697), (28, 760026), (42, 506684), (56, 380013), (84, 253342), (168, 126671), (197, 108024), (394, 54012), (591, 36008), (643, 33096), (788, 27006), (1182, 18004), (1286, 16548), (1379, 15432), (1576, 13503), (1929, 11032), (2364, 9002), (2572, 8274), (2758, 7716), (3858, 5516), (4137, 5144), (4501, 4728)]