20856440

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{107}}^1\times {\mathrm{443}}^1$

素因数の和:572

約数の個数: 64

約数和(自身を含む): 51788160

約数和(自身を除く): 30931720

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 107, 110, 214, 220, 428, 440, 443, 535, 856, 886, 1070, 1177, 1772, 2140, 2215, 2354, 3544, 4280, 4430, 4708, 4873, 5885, 8860, 9416, 9746, 11770, 17720, 19492, 23540, 24365, 38984, 47080, 47401, 48730, 94802, 97460, 189604, 194920, 237005, 379208, 474010, 521411, 948020, 1042822, 1896040, 2085644, 2607055, 4171288, 5214110, 10428220, 20856440]

約数ペア:

[(1, 20856440), (2, 10428220), (4, 5214110), (5, 4171288), (8, 2607055), (10, 2085644), (11, 1896040), (20, 1042822), (22, 948020), (40, 521411), (44, 474010), (55, 379208), (88, 237005), (107, 194920), (110, 189604), (214, 97460), (220, 94802), (428, 48730), (440, 47401), (443, 47080), (535, 38984), (856, 24365), (886, 23540), (1070, 19492), (1177, 17720), (1772, 11770), (2140, 9746), (2215, 9416), (2354, 8860), (3544, 5885), (4280, 4873), (4430, 4708)]