20899720

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{419}}^1$

素因数の和:502

約数の個数: 64

約数和(自身を含む): 49896000

約数和(自身を除く): 28996280

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 43, 58, 86, 116, 145, 172, 215, 232, 290, 344, 419, 430, 580, 838, 860, 1160, 1247, 1676, 1720, 2095, 2494, 3352, 4190, 4988, 6235, 8380, 9976, 12151, 12470, 16760, 18017, 24302, 24940, 36034, 48604, 49880, 60755, 72068, 90085, 97208, 121510, 144136, 180170, 243020, 360340, 486040, 522493, 720680, 1044986, 2089972, 2612465, 4179944, 5224930, 10449860, 20899720]

約数ペア:

[(1, 20899720), (2, 10449860), (4, 5224930), (5, 4179944), (8, 2612465), (10, 2089972), (20, 1044986), (29, 720680), (40, 522493), (43, 486040), (58, 360340), (86, 243020), (116, 180170), (145, 144136), (172, 121510), (215, 97208), (232, 90085), (290, 72068), (344, 60755), (419, 49880), (430, 48604), (580, 36034), (838, 24940), (860, 24302), (1160, 18017), (1247, 16760), (1676, 12470), (1720, 12151), (2095, 9976), (2494, 8380), (3352, 6235), (4190, 4988)]