21071225

素因数分解:

$5^2\times 7^2\times {\mathrm{103}}^1\times {\mathrm{167}}^1$

素因数の和:294

約数の個数: 36

約数和(自身を含む): 30873024

約数和(自身を除く): 9801799

約数列:

[1, 5, 7, 25, 35, 49, 103, 167, 175, 245, 515, 721, 835, 1169, 1225, 2575, 3605, 4175, 5047, 5845, 8183, 17201, 18025, 25235, 29225, 40915, 86005, 120407, 126175, 204575, 430025, 602035, 842849, 3010175, 4214245, 21071225]

約数ペア:

[(1, 21071225), (5, 4214245), (7, 3010175), (25, 842849), (35, 602035), (49, 430025), (103, 204575), (167, 126175), (175, 120407), (245, 86005), (515, 40915), (721, 29225), (835, 25235), (1169, 18025), (1225, 17201), (2575, 8183), (3605, 5845), (4175, 5047)]