20978860

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{21407}}^1$

素因数の和:21430

約数の個数: 36

約数和(自身を含む): 51250752

約数和(自身を除く): 30271892

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 21407, 42814, 85628, 107035, 149849, 214070, 299698, 428140, 599396, 749245, 1048943, 1498490, 2097886, 2996980, 4195772, 5244715, 10489430, 20978860]

約数ペア:

[(1, 20978860), (2, 10489430), (4, 5244715), (5, 4195772), (7, 2996980), (10, 2097886), (14, 1498490), (20, 1048943), (28, 749245), (35, 599396), (49, 428140), (70, 299698), (98, 214070), (140, 149849), (196, 107035), (245, 85628), (490, 42814), (980, 21407)]