20978648

素因数分解:

$2^3\times {\mathrm{641}}^1\times {\mathrm{4091}}^1$

素因数の和:4738

約数の個数: 16

約数和(自身を含む): 39405960

約数和(自身を除く): 18427312

約数列:

[1, 2, 4, 8, 641, 1282, 2564, 4091, 5128, 8182, 16364, 32728, 2622331, 5244662, 10489324, 20978648]

約数ペア:

[(1, 20978648), (2, 10489324), (4, 5244662), (8, 2622331), (641, 32728), (1282, 16364), (2564, 8182), (4091, 5128)]