21298225

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{71}}^2$

素因数の和:178

約数の個数: 27

約数和(自身を含む): 29006049

約数和(自身を除く): 7707824

約数列:

[1, 5, 13, 25, 65, 71, 169, 325, 355, 845, 923, 1775, 4225, 4615, 5041, 11999, 23075, 25205, 59995, 65533, 126025, 299975, 327665, 851929, 1638325, 4259645, 21298225]

約数ペア:

[(1, 21298225), (5, 4259645), (13, 1638325), (25, 851929), (65, 327665), (71, 299975), (169, 126025), (325, 65533), (355, 59995), (845, 25205), (923, 23075), (1775, 11999), (4225, 5041)]