18920811

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{9901}}^1$

素因数の和:9931

約数の個数: 24

約数和(自身を含む): 31607184

約数和(自身を除く): 12686373

約数列:

[1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637, 1911, 9901, 29703, 69307, 128713, 207921, 386139, 485149, 900991, 1455447, 2702973, 6306937, 18920811]

約数ペア:

[(1, 18920811), (3, 6306937), (7, 2702973), (13, 1455447), (21, 900991), (39, 485149), (49, 386139), (91, 207921), (147, 128713), (273, 69307), (637, 29703), (1911, 9901)]