19910120

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{1217}}^1$

素因数の和:1637

約数の個数: 32

約数和(自身を含む): 44944200

約数和(自身を除く): 25034080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1217, 1636, 2045, 2434, 3272, 4090, 4868, 6085, 8180, 9736, 12170, 16360, 24340, 48680, 497753, 995506, 1991012, 2488765, 3982024, 4977530, 9955060, 19910120]

約数ペア:

[(1, 19910120), (2, 9955060), (4, 4977530), (5, 3982024), (8, 2488765), (10, 1991012), (20, 995506), (40, 497753), (409, 48680), (818, 24340), (1217, 16360), (1636, 12170), (2045, 9736), (2434, 8180), (3272, 6085), (4090, 4868)]