21495980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{199}}^1\times {\mathrm{491}}^1$

素因数の和:710

約数の個数: 48

約数和(自身を含む): 49593600

約数和(自身を除く): 28097620

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 199, 220, 398, 491, 796, 982, 995, 1964, 1990, 2189, 2455, 3980, 4378, 4910, 5401, 8756, 9820, 10802, 10945, 21604, 21890, 27005, 43780, 54010, 97709, 108020, 195418, 390836, 488545, 977090, 1074799, 1954180, 2149598, 4299196, 5373995, 10747990, 21495980]

約数ペア:

[(1, 21495980), (2, 10747990), (4, 5373995), (5, 4299196), (10, 2149598), (11, 1954180), (20, 1074799), (22, 977090), (44, 488545), (55, 390836), (110, 195418), (199, 108020), (220, 97709), (398, 54010), (491, 43780), (796, 27005), (982, 21890), (995, 21604), (1964, 10945), (1990, 10802), (2189, 9820), (2455, 8756), (3980, 5401), (4378, 4910)]