21291440

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4363}}^1$

素因数の和:4437

約数の個数: 40

約数和(自身を含む): 50325648

約数和(自身を除く): 29034208

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4363, 4880, 8726, 17452, 21815, 34904, 43630, 69808, 87260, 174520, 266143, 349040, 532286, 1064572, 1330715, 2129144, 2661430, 4258288, 5322860, 10645720, 21291440]

約数ペア:

[(1, 21291440), (2, 10645720), (4, 5322860), (5, 4258288), (8, 2661430), (10, 2129144), (16, 1330715), (20, 1064572), (40, 532286), (61, 349040), (80, 266143), (122, 174520), (244, 87260), (305, 69808), (488, 43630), (610, 34904), (976, 21815), (1220, 17452), (2440, 8726), (4363, 4880)]