21489751

素因数分解:

${\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1$

素因数の和:171

約数の個数: 24

約数和(自身を含む): 24668064

約数和(自身を除く): 3178313

約数列:

[1, 17, 23, 53, 61, 289, 391, 901, 1037, 1219, 1403, 3233, 6647, 15317, 17629, 20723, 23851, 54961, 74359, 352291, 405467, 934337, 1264103, 21489751]

約数ペア:

[(1, 21489751), (17, 1264103), (23, 934337), (53, 405467), (61, 352291), (289, 74359), (391, 54961), (901, 23851), (1037, 20723), (1219, 17629), (1403, 15317), (3233, 6647)]