64780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1$

素因数の和:129

約数の個数: 24

約数和(自身を含む): 141120

約数和(自身を除く): 76340

約数列:

[1, 2, 4, 5, 10, 20, 41, 79, 82, 158, 164, 205, 316, 395, 410, 790, 820, 1580, 3239, 6478, 12956, 16195, 32390, 64780]

約数ペア:

[(1, 64780), (2, 32390), (4, 16195), (5, 12956), (10, 6478), (20, 3239), (41, 1580), (79, 820), (82, 790), (158, 410), (164, 395), (205, 316)]