81316880

素因数分解:

$2^4\times 5^1\times {\mathrm{691}}^1\times {\mathrm{1471}}^1$

素因数の和:2175

約数の個数: 40

約数和(自身を含む): 189464064

約数和(自身を除く): 108147184

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 691, 1382, 1471, 2764, 2942, 3455, 5528, 5884, 6910, 7355, 11056, 11768, 13820, 14710, 23536, 27640, 29420, 55280, 58840, 117680, 1016461, 2032922, 4065844, 5082305, 8131688, 10164610, 16263376, 20329220, 40658440, 81316880]

約数ペア:

[(1, 81316880), (2, 40658440), (4, 20329220), (5, 16263376), (8, 10164610), (10, 8131688), (16, 5082305), (20, 4065844), (40, 2032922), (80, 1016461), (691, 117680), (1382, 58840), (1471, 55280), (2764, 29420), (2942, 27640), (3455, 23536), (5528, 14710), (5884, 13820), (6910, 11768), (7355, 11056)]