20987615

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{353}}^1$

素因数の和:439

約数の個数: 32

約数和(自身を含む): 29362176

約数和(自身を除く): 8374561

約数列:

[1, 5, 11, 23, 47, 55, 115, 235, 253, 353, 517, 1081, 1265, 1765, 2585, 3883, 5405, 8119, 11891, 16591, 19415, 40595, 59455, 82955, 89309, 182501, 381593, 446545, 912505, 1907965, 4197523, 20987615]

約数ペア:

[(1, 20987615), (5, 4197523), (11, 1907965), (23, 912505), (47, 446545), (55, 381593), (115, 182501), (235, 89309), (253, 82955), (353, 59455), (517, 40595), (1081, 19415), (1265, 16591), (1765, 11891), (2585, 8119), (3883, 5405)]