20400513

素因数分解:

$3^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{1297}}^1$

素因数の和:1421

約数の個数: 24

約数和(自身を含む): 31961952

約数和(自身を除く): 11561439

約数列:

[1, 3, 7, 21, 49, 107, 147, 321, 749, 1297, 2247, 3891, 5243, 9079, 15729, 27237, 63553, 138779, 190659, 416337, 971453, 2914359, 6800171, 20400513]

約数ペア:

[(1, 20400513), (3, 6800171), (7, 2914359), (21, 971453), (49, 416337), (107, 190659), (147, 138779), (321, 63553), (749, 27237), (1297, 15729), (2247, 9079), (3891, 5243)]