78561980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{281}}^1\times {\mathrm{1997}}^1$

素因数の和:2294

約数の個数: 48

約数和(自身を含む): 189314496

約数和(自身を除く): 110752516

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 281, 562, 1124, 1405, 1967, 1997, 2810, 3934, 3994, 5620, 7868, 7988, 9835, 9985, 13979, 19670, 19970, 27958, 39340, 39940, 55916, 69895, 139790, 279580, 561157, 1122314, 2244628, 2805785, 3928099, 5611570, 7856198, 11223140, 15712396, 19640495, 39280990, 78561980]

約数ペア:

[(1, 78561980), (2, 39280990), (4, 19640495), (5, 15712396), (7, 11223140), (10, 7856198), (14, 5611570), (20, 3928099), (28, 2805785), (35, 2244628), (70, 1122314), (140, 561157), (281, 279580), (562, 139790), (1124, 69895), (1405, 55916), (1967, 39940), (1997, 39340), (2810, 27958), (3934, 19970), (3994, 19670), (5620, 13979), (7868, 9985), (7988, 9835)]