21781011

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{691}}^1$

素因数の和:799

約数の個数: 32

約数和(自身を含む): 35430400

約数和(自身を除く): 13649389

約数列:

[1, 3, 7, 19, 21, 57, 79, 133, 237, 399, 553, 691, 1501, 1659, 2073, 4503, 4837, 10507, 13129, 14511, 31521, 39387, 54589, 91903, 163767, 275709, 382123, 1037191, 1146369, 3111573, 7260337, 21781011]

約数ペア:

[(1, 21781011), (3, 7260337), (7, 3111573), (19, 1146369), (21, 1037191), (57, 382123), (79, 275709), (133, 163767), (237, 91903), (399, 54589), (553, 39387), (691, 31521), (1501, 14511), (1659, 13129), (2073, 10507), (4503, 4837)]