20421905

素因数分解:

$5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{4259}}^1$

素因数の和:4408

約数の個数: 16

約数和(自身を含む): 28218240

約数和(自身を除く): 7796335

約数列:

[1, 5, 7, 35, 137, 685, 959, 4259, 4795, 21295, 29813, 149065, 583483, 2917415, 4084381, 20421905]

約数ペア:

[(1, 20421905), (5, 4084381), (7, 2917415), (35, 583483), (137, 149065), (685, 29813), (959, 21295), (4259, 4795)]