19908903

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{1217}}^1$

素因数の和:1287

約数の個数: 32

約数和(自身を含む): 32739840

約数和(自身を除く): 12830937

約数列:

[1, 3, 7, 19, 21, 41, 57, 123, 133, 287, 399, 779, 861, 1217, 2337, 3651, 5453, 8519, 16359, 23123, 25557, 49897, 69369, 149691, 161861, 349279, 485583, 948043, 1047837, 2844129, 6636301, 19908903]

約数ペア:

[(1, 19908903), (3, 6636301), (7, 2844129), (19, 1047837), (21, 948043), (41, 485583), (57, 349279), (123, 161861), (133, 149691), (287, 69369), (399, 49897), (779, 25557), (861, 23123), (1217, 16359), (2337, 8519), (3651, 5453)]