205720120

素因数分解:

$2^3\times 5^1\times {\mathrm{647}}^1\times {\mathrm{7949}}^1$

素因数の和:8607

約数の個数: 32

約数和(自身を含む): 463644000

約数和(自身を除く): 257923880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 647, 1294, 2588, 3235, 5176, 6470, 7949, 12940, 15898, 25880, 31796, 39745, 63592, 79490, 158980, 317960, 5143003, 10286006, 20572012, 25715015, 41144024, 51430030, 102860060, 205720120]

約数ペア:

[(1, 205720120), (2, 102860060), (4, 51430030), (5, 41144024), (8, 25715015), (10, 20572012), (20, 10286006), (40, 5143003), (647, 317960), (1294, 158980), (2588, 79490), (3235, 63592), (5176, 39745), (6470, 31796), (7949, 25880), (12940, 15898)]