21993039

素因数分解:

$3^4\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1$

素因数の和:221

約数の個数: 40

約数和(自身を含む): 34499520

約数和(自身を除く): 12506481

約数列:

[1, 3, 9, 27, 47, 53, 81, 109, 141, 159, 327, 423, 477, 981, 1269, 1431, 2491, 2943, 3807, 4293, 5123, 5777, 7473, 8829, 15369, 17331, 22419, 46107, 51993, 67257, 138321, 155979, 201771, 271519, 414963, 467937, 814557, 2443671, 7331013, 21993039]

約数ペア:

[(1, 21993039), (3, 7331013), (9, 2443671), (27, 814557), (47, 467937), (53, 414963), (81, 271519), (109, 201771), (141, 155979), (159, 138321), (327, 67257), (423, 51993), (477, 46107), (981, 22419), (1269, 17331), (1431, 15369), (2491, 8829), (2943, 7473), (3807, 5777), (4293, 5123)]