19978605

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{97}}^1\times {\mathrm{199}}^1$

素因数の和:330

約数の個数: 48

約数和(自身を含む): 36691200

約数和(自身を除く): 16712595

約数列:

[1, 3, 5, 9, 15, 23, 45, 69, 97, 115, 199, 207, 291, 345, 485, 597, 873, 995, 1035, 1455, 1791, 2231, 2985, 4365, 4577, 6693, 8955, 11155, 13731, 19303, 20079, 22885, 33465, 41193, 57909, 68655, 96515, 100395, 173727, 205965, 289545, 443969, 868635, 1331907, 2219845, 3995721, 6659535, 19978605]

約数ペア:

[(1, 19978605), (3, 6659535), (5, 3995721), (9, 2219845), (15, 1331907), (23, 868635), (45, 443969), (69, 289545), (97, 205965), (115, 173727), (199, 100395), (207, 96515), (291, 68655), (345, 57909), (485, 41193), (597, 33465), (873, 22885), (995, 20079), (1035, 19303), (1455, 13731), (1791, 11155), (2231, 8955), (2985, 6693), (4365, 4577)]