21729407

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{199}}^1\times {\mathrm{821}}^1$

素因数の和:1046

約数の個数: 16

約数和(自身を含む): 26304000

約数和(自身を除く): 4574593

約数列:

[1, 7, 19, 133, 199, 821, 1393, 3781, 5747, 15599, 26467, 109193, 163379, 1143653, 3104201, 21729407]

約数ペア:

[(1, 21729407), (7, 3104201), (19, 1143653), (133, 163379), (199, 109193), (821, 26467), (1393, 15599), (3781, 5747)]