20985975

素因数分解:

$3^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{4909}}^1$

素因数の和:4944

約数の個数: 36

約数和(自身を含む): 39574600

約数和(自身を除く): 18588625

約数列:

[1, 3, 5, 9, 15, 19, 25, 45, 57, 75, 95, 171, 225, 285, 475, 855, 1425, 4275, 4909, 14727, 24545, 44181, 73635, 93271, 122725, 220905, 279813, 368175, 466355, 839439, 1104525, 1399065, 2331775, 4197195, 6995325, 20985975]

約数ペア:

[(1, 20985975), (3, 6995325), (5, 4197195), (9, 2331775), (15, 1399065), (19, 1104525), (25, 839439), (45, 466355), (57, 368175), (75, 279813), (95, 220905), (171, 122725), (225, 93271), (285, 73635), (475, 44181), (855, 24545), (1425, 14727), (4275, 4909)]