16921989

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{211}}^1$

素因数の和:310

約数の個数: 48

約数和(自身を含む): 29985280

約数和(自身を除く): 13063291

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 67, 133, 171, 201, 211, 399, 469, 603, 633, 1197, 1273, 1407, 1477, 1899, 3819, 4009, 4221, 4431, 8911, 11457, 12027, 13293, 14137, 26733, 28063, 36081, 42411, 80199, 84189, 98959, 127233, 252567, 268603, 296877, 805809, 890631, 1880221, 2417427, 5640663, 16921989]

約数ペア:

[(1, 16921989), (3, 5640663), (7, 2417427), (9, 1880221), (19, 890631), (21, 805809), (57, 296877), (63, 268603), (67, 252567), (133, 127233), (171, 98959), (201, 84189), (211, 80199), (399, 42411), (469, 36081), (603, 28063), (633, 26733), (1197, 14137), (1273, 13293), (1407, 12027), (1477, 11457), (1899, 8911), (3819, 4431), (4009, 4221)]