128972440

素因数分解:

$2^3\times 5^1\times {\mathrm{431}}^1\times {\mathrm{7481}}^1$

素因数の和:7923

約数の個数: 32

約数和(自身を含む): 290900160

約数和(自身を除く): 161927720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 431, 862, 1724, 2155, 3448, 4310, 7481, 8620, 14962, 17240, 29924, 37405, 59848, 74810, 149620, 299240, 3224311, 6448622, 12897244, 16121555, 25794488, 32243110, 64486220, 128972440]

約数ペア:

[(1, 128972440), (2, 64486220), (4, 32243110), (5, 25794488), (8, 16121555), (10, 12897244), (20, 6448622), (40, 3224311), (431, 299240), (862, 149620), (1724, 74810), (2155, 59848), (3448, 37405), (4310, 29924), (7481, 17240), (8620, 14962)]