20309575

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{23}}^1$

素因数の和:89

約数の個数: 72

約数和(自身を含む): 32676480

約数和(自身を除く): 12366905

約数列:

[1, 5, 11, 13, 19, 23, 25, 55, 65, 95, 115, 143, 169, 209, 247, 253, 275, 299, 325, 437, 475, 575, 715, 845, 1045, 1235, 1265, 1495, 1859, 2185, 2717, 3211, 3289, 3575, 3887, 4225, 4807, 5225, 5681, 6175, 6325, 7475, 9295, 10925, 13585, 16055, 16445, 19435, 24035, 28405, 35321, 42757, 46475, 62491, 67925, 73853, 80275, 82225, 97175, 120175, 142025, 176605, 213785, 312455, 369265, 812383, 883025, 1068925, 1562275, 1846325, 4061915, 20309575]

約数ペア:

[(1, 20309575), (5, 4061915), (11, 1846325), (13, 1562275), (19, 1068925), (23, 883025), (25, 812383), (55, 369265), (65, 312455), (95, 213785), (115, 176605), (143, 142025), (169, 120175), (209, 97175), (247, 82225), (253, 80275), (275, 73853), (299, 67925), (325, 62491), (437, 46475), (475, 42757), (575, 35321), (715, 28405), (845, 24035), (1045, 19435), (1235, 16445), (1265, 16055), (1495, 13585), (1859, 10925), (2185, 9295), (2717, 7475), (3211, 6325), (3289, 6175), (3575, 5681), (3887, 5225), (4225, 4807)]