20921420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{1201}}^1$

素因数の和:1290

約数の個数: 48

約数和(自身を含む): 48060768

約数和(自身を除く): 27139348

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 67, 130, 134, 260, 268, 335, 670, 871, 1201, 1340, 1742, 2402, 3484, 4355, 4804, 6005, 8710, 12010, 15613, 17420, 24020, 31226, 62452, 78065, 80467, 156130, 160934, 312260, 321868, 402335, 804670, 1046071, 1609340, 2092142, 4184284, 5230355, 10460710, 20921420]

約数ペア:

[(1, 20921420), (2, 10460710), (4, 5230355), (5, 4184284), (10, 2092142), (13, 1609340), (20, 1046071), (26, 804670), (52, 402335), (65, 321868), (67, 312260), (130, 160934), (134, 156130), (260, 80467), (268, 78065), (335, 62452), (670, 31226), (871, 24020), (1201, 17420), (1340, 15613), (1742, 12010), (2402, 8710), (3484, 6005), (4355, 4804)]