21257355

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{443}}^1\times {\mathrm{457}}^1$

素因数の和:915

約数の個数: 32

約数和(自身を含む): 39043584

約数和(自身を除く): 17786229

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 443, 457, 1329, 1371, 2215, 2285, 3101, 3199, 6645, 6855, 9303, 9597, 15505, 15995, 46515, 47985, 202451, 607353, 1012255, 1417157, 3036765, 4251471, 7085785, 21257355]

約数ペア:

[(1, 21257355), (3, 7085785), (5, 4251471), (7, 3036765), (15, 1417157), (21, 1012255), (35, 607353), (105, 202451), (443, 47985), (457, 46515), (1329, 15995), (1371, 15505), (2215, 9597), (2285, 9303), (3101, 6855), (3199, 6645)]