21517405

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^2\times {\mathrm{131}}^1$

素因数の和:194

約数の個数: 48

約数和(自身を含む): 33796224

約数和(自身を除く): 12278819

約数列:

[1, 5, 7, 13, 19, 35, 65, 91, 95, 131, 133, 247, 361, 455, 655, 665, 917, 1235, 1703, 1729, 1805, 2489, 2527, 4585, 4693, 8515, 8645, 11921, 12445, 12635, 17423, 23465, 32357, 32851, 47291, 59605, 87115, 161785, 164255, 226499, 236455, 331037, 614783, 1132495, 1655185, 3073915, 4303481, 21517405]

約数ペア:

[(1, 21517405), (5, 4303481), (7, 3073915), (13, 1655185), (19, 1132495), (35, 614783), (65, 331037), (91, 236455), (95, 226499), (131, 164255), (133, 161785), (247, 87115), (361, 59605), (455, 47291), (655, 32851), (665, 32357), (917, 23465), (1235, 17423), (1703, 12635), (1729, 12445), (1805, 11921), (2489, 8645), (2527, 8515), (4585, 4693)]