21139120

素因数分解:

$2^4\times 5^1\times {\mathrm{139}}^1\times {\mathrm{1901}}^1$

素因数の和:2053

約数の個数: 40

約数和(自身を含む): 49528080

約数和(自身を除く): 28388960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 139, 278, 556, 695, 1112, 1390, 1901, 2224, 2780, 3802, 5560, 7604, 9505, 11120, 15208, 19010, 30416, 38020, 76040, 152080, 264239, 528478, 1056956, 1321195, 2113912, 2642390, 4227824, 5284780, 10569560, 21139120]

約数ペア:

[(1, 21139120), (2, 10569560), (4, 5284780), (5, 4227824), (8, 2642390), (10, 2113912), (16, 1321195), (20, 1056956), (40, 528478), (80, 264239), (139, 152080), (278, 76040), (556, 38020), (695, 30416), (1112, 19010), (1390, 15208), (1901, 11120), (2224, 9505), (2780, 7604), (3802, 5560)]