20904325

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{491}}^1$

素因数の和:645

約数の個数: 24

約数和(自身を含む): 28185696

約数和(自身を除く): 7281371

約数列:

[1, 5, 13, 25, 65, 131, 325, 491, 655, 1703, 2455, 3275, 6383, 8515, 12275, 31915, 42575, 64321, 159575, 321605, 836173, 1608025, 4180865, 20904325]

約数ペア:

[(1, 20904325), (5, 4180865), (13, 1608025), (25, 836173), (65, 321605), (131, 159575), (325, 64321), (491, 42575), (655, 31915), (1703, 12275), (2455, 8515), (3275, 6383)]