21278865

素因数分解:

$3^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{683}}^1$

素因数の和:789

約数の個数: 32

約数和(自身を含む): 35721216

約数和(自身を除く): 14442351

約数列:

[1, 3, 5, 15, 31, 67, 93, 155, 201, 335, 465, 683, 1005, 2049, 2077, 3415, 6231, 10245, 10385, 21173, 31155, 45761, 63519, 105865, 137283, 228805, 317595, 686415, 1418591, 4255773, 7092955, 21278865]

約数ペア:

[(1, 21278865), (3, 7092955), (5, 4255773), (15, 1418591), (31, 686415), (67, 317595), (93, 228805), (155, 137283), (201, 105865), (335, 63519), (465, 45761), (683, 31155), (1005, 21173), (2049, 10385), (2077, 10245), (3415, 6231)]