128661640

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{6551}}^1$

素因数の和:7053

約数の個数: 32

約数和(自身を含む): 290122560

約数和(自身を除く): 161460920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 982, 1964, 2455, 3928, 4910, 6551, 9820, 13102, 19640, 26204, 32755, 52408, 65510, 131020, 262040, 3216541, 6433082, 12866164, 16082705, 25732328, 32165410, 64330820, 128661640]

約数ペア:

[(1, 128661640), (2, 64330820), (4, 32165410), (5, 25732328), (8, 16082705), (10, 12866164), (20, 6433082), (40, 3216541), (491, 262040), (982, 131020), (1964, 65510), (2455, 52408), (3928, 32755), (4910, 26204), (6551, 19640), (9820, 13102)]