21306729

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{73}}^1\times {\mathrm{97}}^1$

素因数の和:249

約数の個数: 32

約数和(自身を含む): 31328640

約数和(自身を除く): 10021911

約数列:

[1, 3, 17, 51, 59, 73, 97, 177, 219, 291, 1003, 1241, 1649, 3009, 3723, 4307, 4947, 5723, 7081, 12921, 17169, 21243, 73219, 97291, 120377, 219657, 291873, 361131, 417779, 1253337, 7102243, 21306729]

約数ペア:

[(1, 21306729), (3, 7102243), (17, 1253337), (51, 417779), (59, 361131), (73, 291873), (97, 219657), (177, 120377), (219, 97291), (291, 73219), (1003, 21243), (1241, 17169), (1649, 12921), (3009, 7081), (3723, 5723), (4307, 4947)]