18819728

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{1997}}^1$

素因数の和:2055

約数の個数: 40

約数和(自身を含む): 39640320

約数和(自身を除く): 20820592

約数列:

[1, 2, 4, 8, 16, 19, 31, 38, 62, 76, 124, 152, 248, 304, 496, 589, 1178, 1997, 2356, 3994, 4712, 7988, 9424, 15976, 31952, 37943, 61907, 75886, 123814, 151772, 247628, 303544, 495256, 607088, 990512, 1176233, 2352466, 4704932, 9409864, 18819728]

約数ペア:

[(1, 18819728), (2, 9409864), (4, 4704932), (8, 2352466), (16, 1176233), (19, 990512), (31, 607088), (38, 495256), (62, 303544), (76, 247628), (124, 151772), (152, 123814), (248, 75886), (304, 61907), (496, 37943), (589, 31952), (1178, 15976), (1997, 9424), (2356, 7988), (3994, 4712)]