20912787

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{17471}}^1$

素因数の和:17503

約数の個数: 24

約数和(自身を含む): 36341760

約数和(自身を除く): 15428973

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 133, 171, 399, 1197, 17471, 52413, 122297, 157239, 331949, 366891, 995847, 1100673, 2323643, 2987541, 6970929, 20912787]

約数ペア:

[(1, 20912787), (3, 6970929), (7, 2987541), (9, 2323643), (19, 1100673), (21, 995847), (57, 366891), (63, 331949), (133, 157239), (171, 122297), (399, 52413), (1197, 17471)]