20690140

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{131}}^1\times {\mathrm{149}}^1$

素因数の和:342

約数の個数: 48

約数和(自身を含む): 44906400

約数和(自身を除く): 24216260

約数列:

[1, 2, 4, 5, 10, 20, 53, 106, 131, 149, 212, 262, 265, 298, 524, 530, 596, 655, 745, 1060, 1310, 1490, 2620, 2980, 6943, 7897, 13886, 15794, 19519, 27772, 31588, 34715, 39038, 39485, 69430, 78076, 78970, 97595, 138860, 157940, 195190, 390380, 1034507, 2069014, 4138028, 5172535, 10345070, 20690140]

約数ペア:

[(1, 20690140), (2, 10345070), (4, 5172535), (5, 4138028), (10, 2069014), (20, 1034507), (53, 390380), (106, 195190), (131, 157940), (149, 138860), (212, 97595), (262, 78970), (265, 78076), (298, 69430), (524, 39485), (530, 39038), (596, 34715), (655, 31588), (745, 27772), (1060, 19519), (1310, 15794), (1490, 13886), (2620, 7897), (2980, 6943)]