18990778

素因数分解:

$2^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{9601}}^1$

素因数の和:9669

約数の個数: 16

約数和(自身を含む): 30419136

約数和(自身を除く): 11428358

約数列:

[1, 2, 23, 43, 46, 86, 989, 1978, 9601, 19202, 220823, 412843, 441646, 825686, 9495389, 18990778]

約数ペア:

[(1, 18990778), (2, 9495389), (23, 825686), (43, 441646), (46, 412843), (86, 220823), (989, 19202), (1978, 9601)]