12640840

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{4451}}^1$

素因数の和:4533

約数の個数: 32

約数和(自身を含む): 28848960

約数和(自身を除く): 16208120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 4451, 8902, 17804, 22255, 35608, 44510, 89020, 178040, 316021, 632042, 1264084, 1580105, 2528168, 3160210, 6320420, 12640840]

約数ペア:

[(1, 12640840), (2, 6320420), (4, 3160210), (5, 2528168), (8, 1580105), (10, 1264084), (20, 632042), (40, 316021), (71, 178040), (142, 89020), (284, 44510), (355, 35608), (568, 22255), (710, 17804), (1420, 8902), (2840, 4451)]