21390928

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{102841}}^1$

素因数の和:102862

約数の個数: 20

約数和(自身を含む): 44633428

約数和(自身を除く): 23242500

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 102841, 205682, 411364, 822728, 1336933, 1645456, 2673866, 5347732, 10695464, 21390928]

約数ペア:

[(1, 21390928), (2, 10695464), (4, 5347732), (8, 2673866), (13, 1645456), (16, 1336933), (26, 822728), (52, 411364), (104, 205682), (208, 102841)]