20580399

素因数分解:

$3^6\times 7^1\times {\mathrm{37}}^1\times {\mathrm{109}}^1$

素因数の和:171

約数の個数: 56

約数和(自身を含む): 36549920

約数和(自身を除く): 15969521

約数列:

[1, 3, 7, 9, 21, 27, 37, 63, 81, 109, 111, 189, 243, 259, 327, 333, 567, 729, 763, 777, 981, 999, 1701, 2289, 2331, 2943, 2997, 4033, 5103, 6867, 6993, 8829, 8991, 12099, 20601, 20979, 26487, 26973, 28231, 36297, 61803, 62937, 79461, 84693, 108891, 185409, 188811, 254079, 326673, 556227, 762237, 980019, 2286711, 2940057, 6860133, 20580399]

約数ペア:

[(1, 20580399), (3, 6860133), (7, 2940057), (9, 2286711), (21, 980019), (27, 762237), (37, 556227), (63, 326673), (81, 254079), (109, 188811), (111, 185409), (189, 108891), (243, 84693), (259, 79461), (327, 62937), (333, 61803), (567, 36297), (729, 28231), (763, 26973), (777, 26487), (981, 20979), (999, 20601), (1701, 12099), (2289, 8991), (2331, 8829), (2943, 6993), (2997, 6867), (4033, 5103)]