21215997

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{31}}^2\times {\mathrm{223}}^1$

素因数の和:302

約数の個数: 36

約数和(自身を含む): 34699392

約数和(自身を除く): 13483395

約数列:

[1, 3, 9, 11, 31, 33, 93, 99, 223, 279, 341, 669, 961, 1023, 2007, 2453, 2883, 3069, 6913, 7359, 8649, 10571, 20739, 22077, 31713, 62217, 76043, 95139, 214303, 228129, 642909, 684387, 1928727, 2357333, 7071999, 21215997]

約数ペア:

[(1, 21215997), (3, 7071999), (9, 2357333), (11, 1928727), (31, 684387), (33, 642909), (93, 228129), (99, 214303), (223, 95139), (279, 76043), (341, 62217), (669, 31713), (961, 22077), (1023, 20739), (2007, 10571), (2453, 8649), (2883, 7359), (3069, 6913)]