21010220

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{1949}}^1$

素因数の和:1983

約数の個数: 72

約数和(自身を含む): 56019600

約数和(自身を除く): 35009380

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 49, 55, 70, 77, 98, 110, 140, 154, 196, 220, 245, 308, 385, 490, 539, 770, 980, 1078, 1540, 1949, 2156, 2695, 3898, 5390, 7796, 9745, 10780, 13643, 19490, 21439, 27286, 38980, 42878, 54572, 68215, 85756, 95501, 107195, 136430, 150073, 191002, 214390, 272860, 300146, 382004, 428780, 477505, 600292, 750365, 955010, 1050511, 1500730, 1910020, 2101022, 3001460, 4202044, 5252555, 10505110, 21010220]

約数ペア:

[(1, 21010220), (2, 10505110), (4, 5252555), (5, 4202044), (7, 3001460), (10, 2101022), (11, 1910020), (14, 1500730), (20, 1050511), (22, 955010), (28, 750365), (35, 600292), (44, 477505), (49, 428780), (55, 382004), (70, 300146), (77, 272860), (98, 214390), (110, 191002), (140, 150073), (154, 136430), (196, 107195), (220, 95501), (245, 85756), (308, 68215), (385, 54572), (490, 42878), (539, 38980), (770, 27286), (980, 21439), (1078, 19490), (1540, 13643), (1949, 10780), (2156, 9745), (2695, 7796), (3898, 5390)]