21538657

素因数分解:

$7^1\times {\mathrm{43}}^1\times {\mathrm{163}}^1\times {\mathrm{439}}^1$

素因数の和:652

約数の個数: 16

約数和(自身を含む): 25400320

約数和(自身を除く): 3861663

約数列:

[1, 7, 43, 163, 301, 439, 1141, 3073, 7009, 18877, 49063, 71557, 132139, 500899, 3076951, 21538657]

約数ペア:

[(1, 21538657), (7, 3076951), (43, 500899), (163, 132139), (301, 71557), (439, 49063), (1141, 18877), (3073, 7009)]