21383780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^2\times {\mathrm{71}}^1$

素因数の和:165

約数の個数: 72

約数和(自身を含む): 51057216

約数和(自身を除く): 29673436

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 37, 44, 55, 71, 74, 110, 142, 148, 185, 220, 284, 355, 370, 407, 710, 740, 781, 814, 1369, 1420, 1562, 1628, 2035, 2627, 2738, 3124, 3905, 4070, 5254, 5476, 6845, 7810, 8140, 10508, 13135, 13690, 15059, 15620, 26270, 27380, 28897, 30118, 52540, 57794, 60236, 75295, 97199, 115588, 144485, 150590, 194398, 288970, 301180, 388796, 485995, 577940, 971990, 1069189, 1943980, 2138378, 4276756, 5345945, 10691890, 21383780]

約数ペア:

[(1, 21383780), (2, 10691890), (4, 5345945), (5, 4276756), (10, 2138378), (11, 1943980), (20, 1069189), (22, 971990), (37, 577940), (44, 485995), (55, 388796), (71, 301180), (74, 288970), (110, 194398), (142, 150590), (148, 144485), (185, 115588), (220, 97199), (284, 75295), (355, 60236), (370, 57794), (407, 52540), (710, 30118), (740, 28897), (781, 27380), (814, 26270), (1369, 15620), (1420, 15059), (1562, 13690), (1628, 13135), (2035, 10508), (2627, 8140), (2738, 7810), (3124, 6845), (3905, 5476), (4070, 5254)]