21399005

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{59}}^1\times {\mathrm{251}}^1$

素因数の和:349

約数の個数: 24

約数和(自身を含む): 27851040

約数和(自身を除く): 6452035

約数列:

[1, 5, 17, 59, 85, 251, 289, 295, 1003, 1255, 1445, 4267, 5015, 14809, 17051, 21335, 72539, 74045, 85255, 251753, 362695, 1258765, 4279801, 21399005]

約数ペア:

[(1, 21399005), (5, 4279801), (17, 1258765), (59, 362695), (85, 251753), (251, 85255), (289, 74045), (295, 72539), (1003, 21335), (1255, 17051), (1445, 14809), (4267, 5015)]