393890020

素因数分解:

$2^2\times 5^1\times {\mathrm{491}}^1\times {\mathrm{40111}}^1$

素因数の和:40611

約数の個数: 24

約数和(自身を含む): 828874368

約数和(自身を除く): 434984348

約数列:

[1, 2, 4, 5, 10, 20, 491, 982, 1964, 2455, 4910, 9820, 40111, 80222, 160444, 200555, 401110, 802220, 19694501, 39389002, 78778004, 98472505, 196945010, 393890020]

約数ペア:

[(1, 393890020), (2, 196945010), (4, 98472505), (5, 78778004), (10, 39389002), (20, 19694501), (491, 802220), (982, 401110), (1964, 200555), (2455, 160444), (4910, 80222), (9820, 40111)]