1290140

素因数分解:

$2^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{257}}^1$

素因数の和:517

約数の個数: 24

約数和(自身を含む): 2730672

約数和(自身を除く): 1440532

約数列:

[1, 2, 4, 5, 10, 20, 251, 257, 502, 514, 1004, 1028, 1255, 1285, 2510, 2570, 5020, 5140, 64507, 129014, 258028, 322535, 645070, 1290140]

約数ペア:

[(1, 1290140), (2, 645070), (4, 322535), (5, 258028), (10, 129014), (20, 64507), (251, 5140), (257, 5020), (502, 2570), (514, 2510), (1004, 1285), (1028, 1255)]