21393999

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{6971}}^1$

素因数の和:7019

約数の個数: 24

約数和(自身を含む): 34804224

約数和(自身を除く): 13410225

約数列:

[1, 3, 9, 11, 31, 33, 93, 99, 279, 341, 1023, 3069, 6971, 20913, 62739, 76681, 216101, 230043, 648303, 690129, 1944909, 2377111, 7131333, 21393999]

約数ペア:

[(1, 21393999), (3, 7131333), (9, 2377111), (11, 1944909), (31, 690129), (33, 648303), (93, 230043), (99, 216101), (279, 76681), (341, 62739), (1023, 20913), (3069, 6971)]