21278416

素因数分解:

$2^4\times {\mathrm{71}}^1\times {\mathrm{18731}}^1$

素因数の和:18810

約数の個数: 20

約数和(自身を含む): 41809824

約数和(自身を除く): 20531408

約数列:

[1, 2, 4, 8, 16, 71, 142, 284, 568, 1136, 18731, 37462, 74924, 149848, 299696, 1329901, 2659802, 5319604, 10639208, 21278416]

約数ペア:

[(1, 21278416), (2, 10639208), (4, 5319604), (8, 2659802), (16, 1329901), (71, 299696), (142, 149848), (284, 74924), (568, 37462), (1136, 18731)]