21720418

素因数分解:

$2^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:286

約数の個数: 32

約数和(自身を含む): 35481600

約数和(自身を除く): 13761182

約数列:

[1, 2, 23, 43, 46, 79, 86, 139, 158, 278, 989, 1817, 1978, 3197, 3397, 3634, 5977, 6394, 6794, 10981, 11954, 21962, 78131, 137471, 156262, 252563, 274942, 472183, 505126, 944366, 10860209, 21720418]

約数ペア:

[(1, 21720418), (2, 10860209), (23, 944366), (43, 505126), (46, 472183), (79, 274942), (86, 252563), (139, 156262), (158, 137471), (278, 78131), (989, 21962), (1817, 11954), (1978, 10981), (3197, 6794), (3397, 6394), (3634, 5977)]