21520385

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{53}}^1\times {\mathrm{281}}^1$

素因数の和:373

約数の個数: 24

約数和(自身を含む): 28049976

約数和(自身を除く): 6529591

約数列:

[1, 5, 17, 53, 85, 265, 281, 289, 901, 1405, 1445, 4505, 4777, 14893, 15317, 23885, 74465, 76585, 81209, 253181, 406045, 1265905, 4304077, 21520385]

約数ペア:

[(1, 21520385), (5, 4304077), (17, 1265905), (53, 406045), (85, 253181), (265, 81209), (281, 76585), (289, 74465), (901, 23885), (1405, 15317), (1445, 14893), (4505, 4777)]