21085905

素因数分解:

$3^1\times 5^1\times {\mathrm{67}}^1\times {\mathrm{20981}}^1$

素因数の和:21056

約数の個数: 16

約数和(自身を含む): 34242624

約数和(自身を除く): 13156719

約数列:

[1, 3, 5, 15, 67, 201, 335, 1005, 20981, 62943, 104905, 314715, 1405727, 4217181, 7028635, 21085905]

約数ペア:

[(1, 21085905), (3, 7028635), (5, 4217181), (15, 1405727), (67, 314715), (201, 104905), (335, 62943), (1005, 20981)]