28161819

素因数分解:

$3^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{3361}}^1$

素因数の和:3400

約数の個数: 36

約数和(自身を含む): 49824840

約数和(自身を除く): 21663021

約数列:

[1, 3, 7, 9, 19, 21, 49, 57, 63, 133, 147, 171, 399, 441, 931, 1197, 2793, 3361, 8379, 10083, 23527, 30249, 63859, 70581, 164689, 191577, 211743, 447013, 494067, 574731, 1341039, 1482201, 3129091, 4023117, 9387273, 28161819]

約数ペア:

[(1, 28161819), (3, 9387273), (7, 4023117), (9, 3129091), (19, 1482201), (21, 1341039), (49, 574731), (57, 494067), (63, 447013), (133, 211743), (147, 191577), (171, 164689), (399, 70581), (441, 63859), (931, 30249), (1197, 23527), (2793, 10083), (3361, 8379)]