178020980

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{127}}^1\times {\mathrm{643}}^1$

素因数の和:888

約数の個数: 48

約数和(自身を含む): 380835840

約数和(自身を除く): 202814860

約数列:

[1, 2, 4, 5, 10, 20, 109, 127, 218, 254, 436, 508, 545, 635, 643, 1090, 1270, 1286, 2180, 2540, 2572, 3215, 6430, 12860, 13843, 27686, 55372, 69215, 70087, 81661, 138430, 140174, 163322, 276860, 280348, 326644, 350435, 408305, 700870, 816610, 1401740, 1633220, 8901049, 17802098, 35604196, 44505245, 89010490, 178020980]

約数ペア:

[(1, 178020980), (2, 89010490), (4, 44505245), (5, 35604196), (10, 17802098), (20, 8901049), (109, 1633220), (127, 1401740), (218, 816610), (254, 700870), (436, 408305), (508, 350435), (545, 326644), (635, 280348), (643, 276860), (1090, 163322), (1270, 140174), (1286, 138430), (2180, 81661), (2540, 70087), (2572, 69215), (3215, 55372), (6430, 27686), (12860, 13843)]