257490040

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{15739}}^1$

素因数の和:16159

約数の個数: 32

約数和(自身を含む): 580806000

約数和(自身を除く): 323315960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1636, 2045, 3272, 4090, 8180, 15739, 16360, 31478, 62956, 78695, 125912, 157390, 314780, 629560, 6437251, 12874502, 25749004, 32186255, 51498008, 64372510, 128745020, 257490040]

約数ペア:

[(1, 257490040), (2, 128745020), (4, 64372510), (5, 51498008), (8, 32186255), (10, 25749004), (20, 12874502), (40, 6437251), (409, 629560), (818, 314780), (1636, 157390), (2045, 125912), (3272, 78695), (4090, 62956), (8180, 31478), (15739, 16360)]