20309905

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{743}}^1$

素因数の和:837

約数の個数: 32

約数和(自身を含む): 30855168

約数和(自身を除く): 10545263

約数列:

[1, 5, 7, 11, 35, 55, 71, 77, 355, 385, 497, 743, 781, 2485, 3715, 3905, 5201, 5467, 8173, 26005, 27335, 40865, 52753, 57211, 263765, 286055, 369271, 580283, 1846355, 2901415, 4061981, 20309905]

約数ペア:

[(1, 20309905), (5, 4061981), (7, 2901415), (11, 1846355), (35, 580283), (55, 369271), (71, 286055), (77, 263765), (355, 57211), (385, 52753), (497, 40865), (743, 27335), (781, 26005), (2485, 8173), (3715, 5467), (3905, 5201)]