21189903

素因数分解:

$3^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{3067}}^1$

素因数の和:3131

約数の個数: 24

約数和(自身を含む): 33576192

約数和(自身を除く): 12386289

約数列:

[1, 3, 7, 21, 47, 49, 141, 147, 329, 987, 2303, 3067, 6909, 9201, 21469, 64407, 144149, 150283, 432447, 450849, 1009043, 3027129, 7063301, 21189903]

約数ペア:

[(1, 21189903), (3, 7063301), (7, 3027129), (21, 1009043), (47, 450849), (49, 432447), (141, 150283), (147, 144149), (329, 64407), (987, 21469), (2303, 9201), (3067, 6909)]