21999999

素因数分解:

$3^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1\times {\mathrm{149}}^1$

素因数の和:327

約数の個数: 32

約数和(自身を含む): 34560000

約数和(自身を除く): 12560001

約数列:

[1, 3, 7, 21, 79, 89, 149, 237, 267, 447, 553, 623, 1043, 1659, 1869, 3129, 7031, 11771, 13261, 21093, 35313, 39783, 49217, 82397, 92827, 147651, 247191, 278481, 1047619, 3142857, 7333333, 21999999]

約数ペア:

[(1, 21999999), (3, 7333333), (7, 3142857), (21, 1047619), (79, 278481), (89, 247191), (149, 147651), (237, 92827), (267, 82397), (447, 49217), (553, 39783), (623, 35313), (1043, 21093), (1659, 13261), (1869, 11771), (3129, 7031)]