21210865

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{131}}^1$

素因数の和:249

約数の個数: 32

約数和(自身を含む): 28740096

約数和(自身を除く): 7529231

約数列:

[1, 5, 13, 47, 53, 65, 131, 235, 265, 611, 655, 689, 1703, 2491, 3055, 3445, 6157, 6943, 8515, 12455, 30785, 32383, 34715, 80041, 90259, 161915, 326321, 400205, 451295, 1631605, 4242173, 21210865]

約数ペア:

[(1, 21210865), (5, 4242173), (13, 1631605), (47, 451295), (53, 400205), (65, 326321), (131, 161915), (235, 90259), (265, 80041), (611, 34715), (655, 32383), (689, 30785), (1703, 12455), (2491, 8515), (3055, 6943), (3445, 6157)]