21491764

素因数分解:

$2^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{12583}}^1$

素因数の和:12655

約数の個数: 24

約数和(自身を含む): 43691648

約数和(自身を除く): 22199884

約数列:

[1, 2, 4, 7, 14, 28, 61, 122, 244, 427, 854, 1708, 12583, 25166, 50332, 88081, 176162, 352324, 767563, 1535126, 3070252, 5372941, 10745882, 21491764]

約数ペア:

[(1, 21491764), (2, 10745882), (4, 5372941), (7, 3070252), (14, 1535126), (28, 767563), (61, 352324), (122, 176162), (244, 88081), (427, 50332), (854, 25166), (1708, 12583)]