19801887

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{21929}}^1$

素因数の和:21982

約数の個数: 16

約数和(自身を含む): 30877440

約数和(自身を除く): 11075553

約数列:

[1, 3, 7, 21, 43, 129, 301, 903, 21929, 65787, 153503, 460509, 942947, 2828841, 6600629, 19801887]

約数ペア:

[(1, 19801887), (3, 6600629), (7, 2828841), (21, 942947), (43, 460509), (129, 153503), (301, 65787), (903, 21929)]