21206451

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53149}}^1$

素因数の和:53178

約数の個数: 16

約数和(自身を含む): 34016000

約数和(自身を除く): 12809549

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53149, 159447, 372043, 1009831, 1116129, 3029493, 7068817, 21206451]

約数ペア:

[(1, 21206451), (3, 7068817), (7, 3029493), (19, 1116129), (21, 1009831), (57, 372043), (133, 159447), (399, 53149)]