81721840

素因数分解:

$2^4\times 5^1\times {\mathrm{349}}^1\times {\mathrm{2927}}^1$

素因数の和:3289

約数の個数: 40

約数和(自身を含む): 190612800

約数和(自身を除く): 108890960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 349, 698, 1396, 1745, 2792, 2927, 3490, 5584, 5854, 6980, 11708, 13960, 14635, 23416, 27920, 29270, 46832, 58540, 117080, 234160, 1021523, 2043046, 4086092, 5107615, 8172184, 10215230, 16344368, 20430460, 40860920, 81721840]

約数ペア:

[(1, 81721840), (2, 40860920), (4, 20430460), (5, 16344368), (8, 10215230), (10, 8172184), (16, 5107615), (20, 4086092), (40, 2043046), (80, 1021523), (349, 234160), (698, 117080), (1396, 58540), (1745, 46832), (2792, 29270), (2927, 27920), (3490, 23416), (5584, 14635), (5854, 13960), (6980, 11708)]