21078387

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{577}}^1$

素因数の和:641

約数の個数: 40

約数和(自身を含む): 35248752

約数和(自身を除く): 14170365

約数列:

[1, 3, 9, 11, 27, 33, 41, 81, 99, 123, 297, 369, 451, 577, 891, 1107, 1353, 1731, 3321, 4059, 5193, 6347, 12177, 15579, 19041, 23657, 36531, 46737, 57123, 70971, 171369, 212913, 260227, 514107, 638739, 780681, 1916217, 2342043, 7026129, 21078387]

約数ペア:

[(1, 21078387), (3, 7026129), (9, 2342043), (11, 1916217), (27, 780681), (33, 638739), (41, 514107), (81, 260227), (99, 212913), (123, 171369), (297, 70971), (369, 57123), (451, 46737), (577, 36531), (891, 23657), (1107, 19041), (1353, 15579), (1731, 12177), (3321, 6347), (4059, 5193)]