21880520

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{10321}}^1$

素因数の和:10385

約数の個数: 32

約数和(自身を含む): 50164920

約数和(自身を除く): 28284400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 212, 265, 424, 530, 1060, 2120, 10321, 20642, 41284, 51605, 82568, 103210, 206420, 412840, 547013, 1094026, 2188052, 2735065, 4376104, 5470130, 10940260, 21880520]

約数ペア:

[(1, 21880520), (2, 10940260), (4, 5470130), (5, 4376104), (8, 2735065), (10, 2188052), (20, 1094026), (40, 547013), (53, 412840), (106, 206420), (212, 103210), (265, 82568), (424, 51605), (530, 41284), (1060, 20642), (2120, 10321)]