19901008

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{40123}}^1$

素因数の和:40162

約数の個数: 20

約数和(自身を含む): 39803008

約数和(自身を除く): 19902000

約数列:

[1, 2, 4, 8, 16, 31, 62, 124, 248, 496, 40123, 80246, 160492, 320984, 641968, 1243813, 2487626, 4975252, 9950504, 19901008]

約数ペア:

[(1, 19901008), (2, 9950504), (4, 4975252), (8, 2487626), (16, 1243813), (31, 641968), (62, 320984), (124, 160492), (248, 80246), (496, 40123)]