208902440

素因数分解:

$2^3\times 5^1\times {\mathrm{661}}^1\times {\mathrm{7901}}^1$

素因数の和:8573

約数の個数: 32

約数和(自身を含む): 470801160

約数和(自身を除く): 261898720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 661, 1322, 2644, 3305, 5288, 6610, 7901, 13220, 15802, 26440, 31604, 39505, 63208, 79010, 158020, 316040, 5222561, 10445122, 20890244, 26112805, 41780488, 52225610, 104451220, 208902440]

約数ペア:

[(1, 208902440), (2, 104451220), (4, 52225610), (5, 41780488), (8, 26112805), (10, 20890244), (20, 10445122), (40, 5222561), (661, 316040), (1322, 158020), (2644, 79010), (3305, 63208), (5288, 39505), (6610, 31604), (7901, 26440), (13220, 15802)]