21079708

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31183}}^1$

素因数の和:31213

約数の個数: 18

約数和(自身を含む): 39946704

約数和(自身を除く): 18866996

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31183, 62366, 124732, 405379, 810758, 1621516, 5269927, 10539854, 21079708]

約数ペア:

[(1, 21079708), (2, 10539854), (4, 5269927), (13, 1621516), (26, 810758), (52, 405379), (169, 124732), (338, 62366), (676, 31183)]