21643960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{107}}^1\times {\mathrm{389}}^1$

素因数の和:520

約数の個数: 64

約数和(自身を含む): 53071200

約数和(自身を除く): 31427240

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 107, 130, 214, 260, 389, 428, 520, 535, 778, 856, 1070, 1391, 1556, 1945, 2140, 2782, 3112, 3890, 4280, 5057, 5564, 6955, 7780, 10114, 11128, 13910, 15560, 20228, 25285, 27820, 40456, 41623, 50570, 55640, 83246, 101140, 166492, 202280, 208115, 332984, 416230, 541099, 832460, 1082198, 1664920, 2164396, 2705495, 4328792, 5410990, 10821980, 21643960]

約数ペア:

[(1, 21643960), (2, 10821980), (4, 5410990), (5, 4328792), (8, 2705495), (10, 2164396), (13, 1664920), (20, 1082198), (26, 832460), (40, 541099), (52, 416230), (65, 332984), (104, 208115), (107, 202280), (130, 166492), (214, 101140), (260, 83246), (389, 55640), (428, 50570), (520, 41623), (535, 40456), (778, 27820), (856, 25285), (1070, 20228), (1391, 15560), (1556, 13910), (1945, 11128), (2140, 10114), (2782, 7780), (3112, 6955), (3890, 5564), (4280, 5057)]