21225880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{40819}}^1$

素因数の和:40843

約数の個数: 32

約数和(自身を含む): 51433200

約数和(自身を除く): 30207320

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 40819, 81638, 163276, 204095, 326552, 408190, 530647, 816380, 1061294, 1632760, 2122588, 2653235, 4245176, 5306470, 10612940, 21225880]

約数ペア:

[(1, 21225880), (2, 10612940), (4, 5306470), (5, 4245176), (8, 2653235), (10, 2122588), (13, 1632760), (20, 1061294), (26, 816380), (40, 530647), (52, 408190), (65, 326552), (104, 204095), (130, 163276), (260, 81638), (520, 40819)]