21001281

素因数分解:

$3^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{12659}}^1$

素因数の和:12748

約数の個数: 16

約数和(自身を含む): 32409600

約数和(自身を除く): 11408319

約数列:

[1, 3, 7, 21, 79, 237, 553, 1659, 12659, 37977, 88613, 265839, 1000061, 3000183, 7000427, 21001281]

約数ペア:

[(1, 21001281), (3, 7000427), (7, 3000183), (21, 1000061), (79, 265839), (237, 88613), (553, 37977), (1659, 12659)]