21511567

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1$

素因数の和:223

約数の個数: 32

約数和(自身を含む): 28131840

約数和(自身を除く): 6620273

約数列:

[1, 7, 11, 43, 73, 77, 89, 301, 473, 511, 623, 803, 979, 3139, 3311, 3827, 5621, 6497, 6853, 21973, 26789, 34529, 42097, 45479, 71467, 241703, 279371, 294679, 500269, 1955597, 3073081, 21511567]

約数ペア:

[(1, 21511567), (7, 3073081), (11, 1955597), (43, 500269), (73, 294679), (77, 279371), (89, 241703), (301, 71467), (473, 45479), (511, 42097), (623, 34529), (803, 26789), (979, 21973), (3139, 6853), (3311, 6497), (3827, 5621)]