20918468

素因数分解:

$2^2\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{173}}^1$

素因数の和:276

約数の個数: 48

約数和(自身を含む): 40729920

約数和(自身を除く): 19811452

約数列:

[1, 2, 4, 19, 37, 38, 43, 74, 76, 86, 148, 172, 173, 346, 692, 703, 817, 1406, 1591, 1634, 2812, 3182, 3268, 3287, 6364, 6401, 6574, 7439, 12802, 13148, 14878, 25604, 29756, 30229, 60458, 120916, 121619, 141341, 243238, 275243, 282682, 486476, 550486, 565364, 1100972, 5229617, 10459234, 20918468]

約数ペア:

[(1, 20918468), (2, 10459234), (4, 5229617), (19, 1100972), (37, 565364), (38, 550486), (43, 486476), (74, 282682), (76, 275243), (86, 243238), (148, 141341), (172, 121619), (173, 120916), (346, 60458), (692, 30229), (703, 29756), (817, 25604), (1406, 14878), (1591, 13148), (1634, 12802), (2812, 7439), (3182, 6574), (3268, 6401), (3287, 6364)]