20025775

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{103}}^1$

素因数の和:232

約数の個数: 48

約数和(自身を含む): 31569408

約数和(自身を除く): 11543633

約数列:

[1, 5, 7, 11, 25, 35, 55, 77, 101, 103, 175, 275, 385, 505, 515, 707, 721, 1111, 1133, 1925, 2525, 2575, 3535, 3605, 5555, 5665, 7777, 7931, 10403, 17675, 18025, 27775, 28325, 38885, 39655, 52015, 72821, 114433, 194425, 198275, 260075, 364105, 572165, 801031, 1820525, 2860825, 4005155, 20025775]

約数ペア:

[(1, 20025775), (5, 4005155), (7, 2860825), (11, 1820525), (25, 801031), (35, 572165), (55, 364105), (77, 260075), (101, 198275), (103, 194425), (175, 114433), (275, 72821), (385, 52015), (505, 39655), (515, 38885), (707, 28325), (721, 27775), (1111, 18025), (1133, 17675), (1925, 10403), (2525, 7931), (2575, 7777), (3535, 5665), (3605, 5555)]