20821689

素因数分解:

$3^2\times 7^1\times {\mathrm{349}}^1\times {\mathrm{947}}^1$

素因数の和:1309

約数の個数: 24

約数和(自身を含む): 34507200

約数和(自身を除く): 13685511

約数列:

[1, 3, 7, 9, 21, 63, 349, 947, 1047, 2443, 2841, 3141, 6629, 7329, 8523, 19887, 21987, 59661, 330503, 991509, 2313521, 2974527, 6940563, 20821689]

約数ペア:

[(1, 20821689), (3, 6940563), (7, 2974527), (9, 2313521), (21, 991509), (63, 330503), (349, 59661), (947, 21987), (1047, 19887), (2443, 8523), (2841, 7329), (3141, 6629)]