20977745

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{59}}^1\times {\mathrm{89}}^1$

素因数の和:217

約数の個数: 32

約数和(自身を含む): 27993600

約数和(自身を除く): 7015855

約数列:

[1, 5, 17, 47, 59, 85, 89, 235, 295, 445, 799, 1003, 1513, 2773, 3995, 4183, 5015, 5251, 7565, 13865, 20915, 26255, 47141, 71111, 89267, 235705, 246797, 355555, 446335, 1233985, 4195549, 20977745]

約数ペア:

[(1, 20977745), (5, 4195549), (17, 1233985), (47, 446335), (59, 355555), (85, 246797), (89, 235705), (235, 89267), (295, 71111), (445, 47141), (799, 26255), (1003, 20915), (1513, 13865), (2773, 7565), (3995, 5251), (4183, 5015)]