19640020

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{13831}}^1$

素因数の和:13911

約数の個数: 24

約数和(自身を含む): 41827968

約数和(自身を除く): 22187948

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 13831, 27662, 55324, 69155, 138310, 276620, 982001, 1964002, 3928004, 4910005, 9820010, 19640020]

約数ペア:

[(1, 19640020), (2, 9820010), (4, 4910005), (5, 3928004), (10, 1964002), (20, 982001), (71, 276620), (142, 138310), (284, 69155), (355, 55324), (710, 27662), (1420, 13831)]