21117956

素因数分解:

$2^2\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:212

約数の個数: 48

約数和(自身を含む): 40497408

約数和(自身を除く): 19379452

約数列:

[1, 2, 4, 23, 46, 53, 61, 71, 92, 106, 122, 142, 212, 244, 284, 1219, 1403, 1633, 2438, 2806, 3233, 3266, 3763, 4331, 4876, 5612, 6466, 6532, 7526, 8662, 12932, 15052, 17324, 74359, 86549, 99613, 148718, 173098, 199226, 229543, 297436, 346196, 398452, 459086, 918172, 5279489, 10558978, 21117956]

約数ペア:

[(1, 21117956), (2, 10558978), (4, 5279489), (23, 918172), (46, 459086), (53, 398452), (61, 346196), (71, 297436), (92, 229543), (106, 199226), (122, 173098), (142, 148718), (212, 99613), (244, 86549), (284, 74359), (1219, 17324), (1403, 15052), (1633, 12932), (2438, 8662), (2806, 7526), (3233, 6532), (3266, 6466), (3763, 5612), (4331, 4876)]