21879921

素因数分解:

$3^1\times 7^2\times {\mathrm{251}}^1\times {\mathrm{593}}^1$

素因数の和:861

約数の個数: 24

約数和(自身を含む): 34128864

約数和(自身を除く): 12248943

約数列:

[1, 3, 7, 21, 49, 147, 251, 593, 753, 1757, 1779, 4151, 5271, 12299, 12453, 29057, 36897, 87171, 148843, 446529, 1041901, 3125703, 7293307, 21879921]

約数ペア:

[(1, 21879921), (3, 7293307), (7, 3125703), (21, 1041901), (49, 446529), (147, 148843), (251, 87171), (593, 36897), (753, 29057), (1757, 12453), (1779, 12299), (4151, 5271)]