20680420

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{173}}^1$

素因数の和:364

約数の個数: 48

約数和(自身を含む): 45017280

約数和(自身を除く): 24336860

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 139, 172, 173, 215, 278, 346, 430, 556, 692, 695, 860, 865, 1390, 1730, 2780, 3460, 5977, 7439, 11954, 14878, 23908, 24047, 29756, 29885, 37195, 48094, 59770, 74390, 96188, 119540, 120235, 148780, 240470, 480940, 1034021, 2068042, 4136084, 5170105, 10340210, 20680420]

約数ペア:

[(1, 20680420), (2, 10340210), (4, 5170105), (5, 4136084), (10, 2068042), (20, 1034021), (43, 480940), (86, 240470), (139, 148780), (172, 120235), (173, 119540), (215, 96188), (278, 74390), (346, 59770), (430, 48094), (556, 37195), (692, 29885), (695, 29756), (860, 24047), (865, 23908), (1390, 14878), (1730, 11954), (2780, 7439), (3460, 5977)]