21155212

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{257}}^1\times {\mathrm{1583}}^1$

素因数の和:1857

約数の個数: 24

約数和(自身を含む): 40049856

約数和(自身を除く): 18894644

約数列:

[1, 2, 4, 13, 26, 52, 257, 514, 1028, 1583, 3166, 3341, 6332, 6682, 13364, 20579, 41158, 82316, 406831, 813662, 1627324, 5288803, 10577606, 21155212]

約数ペア:

[(1, 21155212), (2, 10577606), (4, 5288803), (13, 1627324), (26, 813662), (52, 406831), (257, 82316), (514, 41158), (1028, 20579), (1583, 13364), (3166, 6682), (3341, 6332)]