20781285

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{4211}}^1$

素因数の和:4273

約数の個数: 32

約数和(自身を含む): 38817792

約数和(自身を除く): 18036507

約数列:

[1, 3, 5, 7, 15, 21, 35, 47, 105, 141, 235, 329, 705, 987, 1645, 4211, 4935, 12633, 21055, 29477, 63165, 88431, 147385, 197917, 442155, 593751, 989585, 1385419, 2968755, 4156257, 6927095, 20781285]

約数ペア:

[(1, 20781285), (3, 6927095), (5, 4156257), (7, 2968755), (15, 1385419), (21, 989585), (35, 593751), (47, 442155), (105, 197917), (141, 147385), (235, 88431), (329, 63165), (705, 29477), (987, 21055), (1645, 12633), (4211, 4935)]