21520317

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4637}}^1$

素因数の和:4677

約数の個数: 32

約数和(自身を含む): 37400832

約数和(自身を除く): 15880515

約数列:

[1, 3, 7, 13, 17, 21, 39, 51, 91, 119, 221, 273, 357, 663, 1547, 4637, 4641, 13911, 32459, 60281, 78829, 97377, 180843, 236487, 421967, 551803, 1024777, 1265901, 1655409, 3074331, 7173439, 21520317]

約数ペア:

[(1, 21520317), (3, 7173439), (7, 3074331), (13, 1655409), (17, 1265901), (21, 1024777), (39, 551803), (51, 421967), (91, 236487), (119, 180843), (221, 97377), (273, 78829), (357, 60281), (663, 32459), (1547, 13911), (4637, 4641)]