20998215

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{107}}^1$

素因数の和:221

約数の個数: 72

約数和(自身を含む): 43215120

約数和(自身を除く): 22216905

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 49, 63, 89, 105, 107, 147, 245, 267, 315, 321, 441, 445, 535, 623, 735, 749, 801, 963, 1335, 1605, 1869, 2205, 2247, 3115, 3745, 4005, 4361, 4815, 5243, 5607, 6741, 9345, 9523, 11235, 13083, 15729, 21805, 26215, 28035, 28569, 33705, 39249, 47187, 47615, 65415, 66661, 78645, 85707, 142845, 196245, 199983, 235935, 333305, 428535, 466627, 599949, 999915, 1399881, 2333135, 2999745, 4199643, 6999405, 20998215]

約数ペア:

[(1, 20998215), (3, 6999405), (5, 4199643), (7, 2999745), (9, 2333135), (15, 1399881), (21, 999915), (35, 599949), (45, 466627), (49, 428535), (63, 333305), (89, 235935), (105, 199983), (107, 196245), (147, 142845), (245, 85707), (267, 78645), (315, 66661), (321, 65415), (441, 47615), (445, 47187), (535, 39249), (623, 33705), (735, 28569), (749, 28035), (801, 26215), (963, 21805), (1335, 15729), (1605, 13083), (1869, 11235), (2205, 9523), (2247, 9345), (3115, 6741), (3745, 5607), (4005, 5243), (4361, 4815)]