21008

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{101}}^1$

素因数の和:122

約数の個数: 20

約数和(自身を含む): 44268

約数和(自身を除く): 23260

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 101, 104, 202, 208, 404, 808, 1313, 1616, 2626, 5252, 10504, 21008]

約数ペア:

[(1, 21008), (2, 10504), (4, 5252), (8, 2626), (13, 1616), (16, 1313), (26, 808), (52, 404), (101, 208), (104, 202)]