20987571

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{179}}^1$

素因数の和:240

約数の個数: 48

約数和(自身を含む): 34473600

約数和(自身を除く): 13486029

約数列:

[1, 3, 11, 17, 19, 33, 51, 57, 121, 179, 187, 209, 323, 363, 537, 561, 627, 969, 1969, 2057, 2299, 3043, 3401, 3553, 5907, 6171, 6897, 9129, 10203, 10659, 21659, 33473, 37411, 39083, 57817, 64977, 100419, 112233, 117249, 173451, 368203, 411521, 635987, 1104609, 1234563, 1907961, 6995857, 20987571]

約数ペア:

[(1, 20987571), (3, 6995857), (11, 1907961), (17, 1234563), (19, 1104609), (33, 635987), (51, 411521), (57, 368203), (121, 173451), (179, 117249), (187, 112233), (209, 100419), (323, 64977), (363, 57817), (537, 39083), (561, 37411), (627, 33473), (969, 21659), (1969, 10659), (2057, 10203), (2299, 9129), (3043, 6897), (3401, 6171), (3553, 5907)]