21557305

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{421}}^1$

素因数の和:470

約数の個数: 48

約数和(自身を含む): 34637760

約数和(自身を除く): 13080455

約数列:

[1, 5, 7, 11, 19, 35, 49, 55, 77, 95, 133, 209, 245, 385, 421, 539, 665, 931, 1045, 1463, 2105, 2695, 2947, 4631, 4655, 7315, 7999, 10241, 14735, 20629, 23155, 32417, 39995, 51205, 55993, 87989, 103145, 162085, 226919, 279965, 391951, 439945, 615923, 1134595, 1959755, 3079615, 4311461, 21557305]

約数ペア:

[(1, 21557305), (5, 4311461), (7, 3079615), (11, 1959755), (19, 1134595), (35, 615923), (49, 439945), (55, 391951), (77, 279965), (95, 226919), (133, 162085), (209, 103145), (245, 87989), (385, 55993), (421, 51205), (539, 39995), (665, 32417), (931, 23155), (1045, 20629), (1463, 14735), (2105, 10241), (2695, 7999), (2947, 7315), (4631, 4655)]