20987841

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1\times {\mathrm{173}}^1$

素因数の和:345

約数の個数: 32

約数和(自身を含む): 33073920

約数和(自身を除く): 12086079

約数列:

[1, 3, 7, 21, 53, 109, 159, 173, 327, 371, 519, 763, 1113, 1211, 2289, 3633, 5777, 9169, 17331, 18857, 27507, 40439, 56571, 64183, 121317, 131999, 192549, 395997, 999421, 2998263, 6995947, 20987841]

約数ペア:

[(1, 20987841), (3, 6995947), (7, 2998263), (21, 999421), (53, 395997), (109, 192549), (159, 131999), (173, 121317), (327, 64183), (371, 56571), (519, 40439), (763, 27507), (1113, 18857), (1211, 17331), (2289, 9169), (3633, 5777)]