21137571

素因数分解:

$3^3\times 7^2\times {\mathrm{13}}^1\times {\mathrm{1229}}^1$

素因数の和:1265

約数の個数: 48

約数和(自身を含む): 39261600

約数和(自身を除く): 18124029

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 49, 63, 91, 117, 147, 189, 273, 351, 441, 637, 819, 1229, 1323, 1911, 2457, 3687, 5733, 8603, 11061, 15977, 17199, 25809, 33183, 47931, 60221, 77427, 111839, 143793, 180663, 232281, 335517, 431379, 541989, 782873, 1006551, 1625967, 2348619, 3019653, 7045857, 21137571]

約数ペア:

[(1, 21137571), (3, 7045857), (7, 3019653), (9, 2348619), (13, 1625967), (21, 1006551), (27, 782873), (39, 541989), (49, 431379), (63, 335517), (91, 232281), (117, 180663), (147, 143793), (189, 111839), (273, 77427), (351, 60221), (441, 47931), (637, 33183), (819, 25809), (1229, 17199), (1323, 15977), (1911, 11061), (2457, 8603), (3687, 5733)]