21161777

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{239}}^1$

素因数の和:405

約数の個数: 24

約数和(自身を含む): 26812800

約数和(自身を除く): 5651023

約数列:

[1, 7, 13, 49, 91, 139, 239, 637, 973, 1673, 1807, 3107, 6811, 11711, 12649, 21749, 33221, 88543, 152243, 232547, 431873, 1627829, 3023111, 21161777]

約数ペア:

[(1, 21161777), (7, 3023111), (13, 1627829), (49, 431873), (91, 232547), (139, 152243), (239, 88543), (637, 33221), (973, 21749), (1673, 12649), (1807, 11711), (3107, 6811)]