21513813

素因数分解:

$3^1\times {\mathrm{53}}^1\times {\mathrm{269}}^1\times {\mathrm{503}}^1$

素因数の和:828

約数の個数: 16

約数和(自身を含む): 29393280

約数和(自身を除く): 7879467

約数列:

[1, 3, 53, 159, 269, 503, 807, 1509, 14257, 26659, 42771, 79977, 135307, 405921, 7171271, 21513813]

約数ペア:

[(1, 21513813), (3, 7171271), (53, 405921), (159, 135307), (269, 79977), (503, 42771), (807, 26659), (1509, 14257)]