21259905

素因数分解:

$3^1\times 5^1\times {\mathrm{109}}^1\times {\mathrm{13003}}^1$

素因数の和:13120

約数の個数: 16

約数和(自身を含む): 34330560

約数和(自身を除く): 13070655

約数列:

[1, 3, 5, 15, 109, 327, 545, 1635, 13003, 39009, 65015, 195045, 1417327, 4251981, 7086635, 21259905]

約数ペア:

[(1, 21259905), (3, 7086635), (5, 4251981), (15, 1417327), (109, 195045), (327, 65015), (545, 39009), (1635, 13003)]