18989240

素因数分解:

$2^3\times 5^1\times {\mathrm{653}}^1\times {\mathrm{727}}^1$

素因数の和:1391

約数の個数: 32

約数和(自身を含む): 42850080

約数和(自身を除く): 23860840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 653, 727, 1306, 1454, 2612, 2908, 3265, 3635, 5224, 5816, 6530, 7270, 13060, 14540, 26120, 29080, 474731, 949462, 1898924, 2373655, 3797848, 4747310, 9494620, 18989240]

約数ペア:

[(1, 18989240), (2, 9494620), (4, 4747310), (5, 3797848), (8, 2373655), (10, 1898924), (20, 949462), (40, 474731), (653, 29080), (727, 26120), (1306, 14540), (1454, 13060), (2612, 7270), (2908, 6530), (3265, 5816), (3635, 5224)]