20720875

素因数分解:

$5^3\times 7^2\times {\mathrm{17}}^1\times {\mathrm{199}}^1$

素因数の和:245

約数の個数: 48

約数和(自身を含む): 32011200

約数和(自身を除く): 11290325

約数列:

[1, 5, 7, 17, 25, 35, 49, 85, 119, 125, 175, 199, 245, 425, 595, 833, 875, 995, 1225, 1393, 2125, 2975, 3383, 4165, 4975, 6125, 6965, 9751, 14875, 16915, 20825, 23681, 24875, 34825, 48755, 84575, 104125, 118405, 165767, 174125, 243775, 422875, 592025, 828835, 1218875, 2960125, 4144175, 20720875]

約数ペア:

[(1, 20720875), (5, 4144175), (7, 2960125), (17, 1218875), (25, 828835), (35, 592025), (49, 422875), (85, 243775), (119, 174125), (125, 165767), (175, 118405), (199, 104125), (245, 84575), (425, 48755), (595, 34825), (833, 24875), (875, 23681), (995, 20825), (1225, 16915), (1393, 14875), (2125, 9751), (2975, 6965), (3383, 6125), (4165, 4975)]