21215745

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{27733}}^1$

素因数の和:27761

約数の個数: 24

約数和(自身を含む): 38938536

約数和(自身を除く): 17722791

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 27733, 83199, 138665, 249597, 415995, 471461, 1247985, 1414383, 2357305, 4243149, 7071915, 21215745]

約数ペア:

[(1, 21215745), (3, 7071915), (5, 4243149), (9, 2357305), (15, 1414383), (17, 1247985), (45, 471461), (51, 415995), (85, 249597), (153, 138665), (255, 83199), (765, 27733)]