20900000

素因数分解:

$2^5\times 5^5\times {\mathrm{11}}^1\times {\mathrm{19}}^1$

素因数の和:65

約数の個数: 144

約数和(自身を含む): 59058720

約数和(自身を除く): 38158720

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 19, 20, 22, 25, 32, 38, 40, 44, 50, 55, 76, 80, 88, 95, 100, 110, 125, 152, 160, 176, 190, 200, 209, 220, 250, 275, 304, 352, 380, 400, 418, 440, 475, 500, 550, 608, 625, 760, 800, 836, 880, 950, 1000, 1045, 1100, 1250, 1375, 1520, 1672, 1760, 1900, 2000, 2090, 2200, 2375, 2500, 2750, 3040, 3125, 3344, 3800, 4000, 4180, 4400, 4750, 5000, 5225, 5500, 6250, 6688, 6875, 7600, 8360, 8800, 9500, 10000, 10450, 11000, 11875, 12500, 13750, 15200, 16720, 19000, 20000, 20900, 22000, 23750, 25000, 26125, 27500, 33440, 34375, 38000, 41800, 44000, 47500, 50000, 52250, 55000, 59375, 68750, 76000, 83600, 95000, 100000, 104500, 110000, 118750, 130625, 137500, 167200, 190000, 209000, 220000, 237500, 261250, 275000, 380000, 418000, 475000, 522500, 550000, 653125, 836000, 950000, 1045000, 1100000, 1306250, 1900000, 2090000, 2612500, 4180000, 5225000, 10450000, 20900000]

約数ペア:

[(1, 20900000), (2, 10450000), (4, 5225000), (5, 4180000), (8, 2612500), (10, 2090000), (11, 1900000), (16, 1306250), (19, 1100000), (20, 1045000), (22, 950000), (25, 836000), (32, 653125), (38, 550000), (40, 522500), (44, 475000), (50, 418000), (55, 380000), (76, 275000), (80, 261250), (88, 237500), (95, 220000), (100, 209000), (110, 190000), (125, 167200), (152, 137500), (160, 130625), (176, 118750), (190, 110000), (200, 104500), (209, 100000), (220, 95000), (250, 83600), (275, 76000), (304, 68750), (352, 59375), (380, 55000), (400, 52250), (418, 50000), (440, 47500), (475, 44000), (500, 41800), (550, 38000), (608, 34375), (625, 33440), (760, 27500), (800, 26125), (836, 25000), (880, 23750), (950, 22000), (1000, 20900), (1045, 20000), (1100, 19000), (1250, 16720), (1375, 15200), (1520, 13750), (1672, 12500), (1760, 11875), (1900, 11000), (2000, 10450), (2090, 10000), (2200, 9500), (2375, 8800), (2500, 8360), (2750, 7600), (3040, 6875), (3125, 6688), (3344, 6250), (3800, 5500), (4000, 5225), (4180, 5000), (4400, 4750)]