21007861

素因数分解:

$7^1\times {\mathrm{29}}^1\times {\mathrm{239}}^1\times {\mathrm{433}}^1$

素因数の和:708

約数の個数: 16

約数和(自身を含む): 24998400

約数和(自身を除く): 3990539

約数列:

[1, 7, 29, 203, 239, 433, 1673, 3031, 6931, 12557, 48517, 87899, 103487, 724409, 3001123, 21007861]

約数ペア:

[(1, 21007861), (7, 3001123), (29, 724409), (203, 103487), (239, 87899), (433, 48517), (1673, 12557), (3031, 6931)]