21409240

素因数分解:

$2^3\times 5^1\times {\mathrm{311}}^1\times {\mathrm{1721}}^1$

素因数の和:2043

約数の個数: 32

約数和(自身を含む): 48353760

約数和(自身を除く): 26944520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 311, 622, 1244, 1555, 1721, 2488, 3110, 3442, 6220, 6884, 8605, 12440, 13768, 17210, 34420, 68840, 535231, 1070462, 2140924, 2676155, 4281848, 5352310, 10704620, 21409240]

約数ペア:

[(1, 21409240), (2, 10704620), (4, 5352310), (5, 4281848), (8, 2676155), (10, 2140924), (20, 1070462), (40, 535231), (311, 68840), (622, 34420), (1244, 17210), (1555, 13768), (1721, 12440), (2488, 8605), (3110, 6884), (3442, 6220)]