19986855

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{383}}^1$

素因数の和:476

約数の個数: 48

約数和(自身を含む): 37822464

約数和(自身を除く): 17835609

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 71, 105, 147, 213, 245, 355, 383, 497, 735, 1065, 1149, 1491, 1915, 2485, 2681, 3479, 5745, 7455, 8043, 10437, 13405, 17395, 18767, 27193, 40215, 52185, 56301, 81579, 93835, 135965, 190351, 281505, 407895, 571053, 951755, 1332457, 2855265, 3997371, 6662285, 19986855]

約数ペア:

[(1, 19986855), (3, 6662285), (5, 3997371), (7, 2855265), (15, 1332457), (21, 951755), (35, 571053), (49, 407895), (71, 281505), (105, 190351), (147, 135965), (213, 93835), (245, 81579), (355, 56301), (383, 52185), (497, 40215), (735, 27193), (1065, 18767), (1149, 17395), (1491, 13405), (1915, 10437), (2485, 8043), (2681, 7455), (3479, 5745)]