21811720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{77899}}^1$

素因数の和:77917

約数の個数: 32

約数和(自身を含む): 56088000

約数和(自身を除く): 34276280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 77899, 155798, 311596, 389495, 545293, 623192, 778990, 1090586, 1557980, 2181172, 2726465, 3115960, 4362344, 5452930, 10905860, 21811720]

約数ペア:

[(1, 21811720), (2, 10905860), (4, 5452930), (5, 4362344), (7, 3115960), (8, 2726465), (10, 2181172), (14, 1557980), (20, 1090586), (28, 778990), (35, 623192), (40, 545293), (56, 389495), (70, 311596), (140, 155798), (280, 77899)]