21453740

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13931}}^1$

素因数の和:13958

約数の個数: 48

約数和(自身を含む): 56173824

約数和(自身を除く): 34720084

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 13931, 27862, 55724, 69655, 97517, 139310, 153241, 195034, 278620, 306482, 390068, 487585, 612964, 766205, 975170, 1072687, 1532410, 1950340, 2145374, 3064820, 4290748, 5363435, 10726870, 21453740]

約数ペア:

[(1, 21453740), (2, 10726870), (4, 5363435), (5, 4290748), (7, 3064820), (10, 2145374), (11, 1950340), (14, 1532410), (20, 1072687), (22, 975170), (28, 766205), (35, 612964), (44, 487585), (55, 390068), (70, 306482), (77, 278620), (110, 195034), (140, 153241), (154, 139310), (220, 97517), (308, 69655), (385, 55724), (770, 27862), (1540, 13931)]