21070972

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{405211}}^1$

素因数の和:405228

約数の個数: 12

約数和(自身を含む): 39710776

約数和(自身を除く): 18639804

約数列:

[1, 2, 4, 13, 26, 52, 405211, 810422, 1620844, 5267743, 10535486, 21070972]

約数ペア:

[(1, 21070972), (2, 10535486), (4, 5267743), (13, 1620844), (26, 810422), (52, 405211)]