21878505

素因数分解:

$3^5\times 5^1\times {\mathrm{11}}^1\times {\mathrm{1637}}^1$

素因数の和:1668

約数の個数: 48

約数和(自身を含む): 42928704

約数和(自身を除く): 21050199

約数列:

[1, 3, 5, 9, 11, 15, 27, 33, 45, 55, 81, 99, 135, 165, 243, 297, 405, 495, 891, 1215, 1485, 1637, 2673, 4455, 4911, 8185, 13365, 14733, 18007, 24555, 44199, 54021, 73665, 90035, 132597, 162063, 220995, 270105, 397791, 486189, 662985, 810315, 1458567, 1988955, 2430945, 4375701, 7292835, 21878505]

約数ペア:

[(1, 21878505), (3, 7292835), (5, 4375701), (9, 2430945), (11, 1988955), (15, 1458567), (27, 810315), (33, 662985), (45, 486189), (55, 397791), (81, 270105), (99, 220995), (135, 162063), (165, 132597), (243, 90035), (297, 73665), (405, 54021), (495, 44199), (891, 24555), (1215, 18007), (1485, 14733), (1637, 13365), (2673, 8185), (4455, 4911)]