128388820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{131009}}^1$

素因数の和:131032

約数の個数: 36

約数和(自身を含む): 313637940

約数和(自身を除く): 185249120

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 131009, 262018, 524036, 655045, 917063, 1310090, 1834126, 2620180, 3668252, 4585315, 6419441, 9170630, 12838882, 18341260, 25677764, 32097205, 64194410, 128388820]

約数ペア:

[(1, 128388820), (2, 64194410), (4, 32097205), (5, 25677764), (7, 18341260), (10, 12838882), (14, 9170630), (20, 6419441), (28, 4585315), (35, 3668252), (49, 2620180), (70, 1834126), (98, 1310090), (140, 917063), (196, 655045), (245, 524036), (490, 262018), (980, 131009)]