21259917

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{17761}}^1$

素因数の和:17793

約数の個数: 24

約数和(自身を含む): 36944960

約数和(自身を除く): 15685043

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 133, 171, 399, 1197, 17761, 53283, 124327, 159849, 337459, 372981, 1012377, 1118943, 2362213, 3037131, 7086639, 21259917]

約数ペア:

[(1, 21259917), (3, 7086639), (7, 3037131), (9, 2362213), (19, 1118943), (21, 1012377), (57, 372981), (63, 337459), (133, 159849), (171, 124327), (399, 53283), (1197, 17761)]