21420225

素因数分解:

$3^2\times 5^2\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{83}}^1$

素因数の和:167

約数の個数: 72

約数和(自身を含む): 41164032

約数和(自身を除く): 19743807

約数列:

[1, 3, 5, 9, 15, 25, 31, 37, 45, 75, 83, 93, 111, 155, 185, 225, 249, 279, 333, 415, 465, 555, 747, 775, 925, 1147, 1245, 1395, 1665, 2075, 2325, 2573, 2775, 3071, 3441, 3735, 5735, 6225, 6975, 7719, 8325, 9213, 10323, 12865, 15355, 17205, 18675, 23157, 27639, 28675, 38595, 46065, 51615, 64325, 76775, 86025, 95201, 115785, 138195, 192975, 230325, 258075, 285603, 476005, 578925, 690975, 856809, 1428015, 2380025, 4284045, 7140075, 21420225]

約数ペア:

[(1, 21420225), (3, 7140075), (5, 4284045), (9, 2380025), (15, 1428015), (25, 856809), (31, 690975), (37, 578925), (45, 476005), (75, 285603), (83, 258075), (93, 230325), (111, 192975), (155, 138195), (185, 115785), (225, 95201), (249, 86025), (279, 76775), (333, 64325), (415, 51615), (465, 46065), (555, 38595), (747, 28675), (775, 27639), (925, 23157), (1147, 18675), (1245, 17205), (1395, 15355), (1665, 12865), (2075, 10323), (2325, 9213), (2573, 8325), (2775, 7719), (3071, 6975), (3441, 6225), (3735, 5735)]