21855820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{107}}^1\times {\mathrm{1459}}^1$

素因数の和:1582

約数の個数: 48

約数和(自身を含む): 52980480

約数和(自身を除く): 31124660

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 107, 140, 214, 428, 535, 749, 1070, 1459, 1498, 2140, 2918, 2996, 3745, 5836, 7295, 7490, 10213, 14590, 14980, 20426, 29180, 40852, 51065, 102130, 156113, 204260, 312226, 624452, 780565, 1092791, 1561130, 2185582, 3122260, 4371164, 5463955, 10927910, 21855820]

約数ペア:

[(1, 21855820), (2, 10927910), (4, 5463955), (5, 4371164), (7, 3122260), (10, 2185582), (14, 1561130), (20, 1092791), (28, 780565), (35, 624452), (70, 312226), (107, 204260), (140, 156113), (214, 102130), (428, 51065), (535, 40852), (749, 29180), (1070, 20426), (1459, 14980), (1498, 14590), (2140, 10213), (2918, 7490), (2996, 7295), (3745, 5836)]