128380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{131}}^1$

素因数の和:154

約数の個数: 36

約数和(自身を含む): 316008

約数和(自身を除く): 187628

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 131, 140, 196, 245, 262, 490, 524, 655, 917, 980, 1310, 1834, 2620, 3668, 4585, 6419, 9170, 12838, 18340, 25676, 32095, 64190, 128380]

約数ペア:

[(1, 128380), (2, 64190), (4, 32095), (5, 25676), (7, 18340), (10, 12838), (14, 9170), (20, 6419), (28, 4585), (35, 3668), (49, 2620), (70, 1834), (98, 1310), (131, 980), (140, 917), (196, 655), (245, 524), (262, 490)]