21641855

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{131}}^1$

素因数の和:239

約数の個数: 32

約数和(自身を含む): 28892160

約数和(自身を除く): 7250305

約数列:

[1, 5, 19, 37, 47, 95, 131, 185, 235, 655, 703, 893, 1739, 2489, 3515, 4465, 4847, 6157, 8695, 12445, 24235, 30785, 33041, 92093, 116983, 165205, 227809, 460465, 584915, 1139045, 4328371, 21641855]

約数ペア:

[(1, 21641855), (5, 4328371), (19, 1139045), (37, 584915), (47, 460465), (95, 227809), (131, 165205), (185, 116983), (235, 92093), (655, 33041), (703, 30785), (893, 24235), (1739, 12445), (2489, 8695), (3515, 6157), (4465, 4847)]