20778405

素因数分解:

$3^1\times 5^1\times {\mathrm{647}}^1\times {\mathrm{2141}}^1$

素因数の和:2796

約数の個数: 16

約数和(自身を含む): 33312384

約数和(自身を除く): 12533979

約数列:

[1, 3, 5, 15, 647, 1941, 2141, 3235, 6423, 9705, 10705, 32115, 1385227, 4155681, 6926135, 20778405]

約数ペア:

[(1, 20778405), (3, 6926135), (5, 4155681), (15, 1385227), (647, 32115), (1941, 10705), (2141, 9705), (3235, 6423)]