21390561

素因数分解:

$3^5\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{113}}^1$

素因数の和:188

約数の個数: 48

約数和(自身を含む): 34856640

約数和(自身を除く): 13466079

約数列:

[1, 3, 9, 19, 27, 41, 57, 81, 113, 123, 171, 243, 339, 369, 513, 779, 1017, 1107, 1539, 2147, 2337, 3051, 3321, 4617, 4633, 6441, 7011, 9153, 9963, 13899, 19323, 21033, 27459, 41697, 57969, 63099, 88027, 125091, 173907, 189297, 264081, 375273, 521721, 792243, 1125819, 2376729, 7130187, 21390561]

約数ペア:

[(1, 21390561), (3, 7130187), (9, 2376729), (19, 1125819), (27, 792243), (41, 521721), (57, 375273), (81, 264081), (113, 189297), (123, 173907), (171, 125091), (243, 88027), (339, 63099), (369, 57969), (513, 41697), (779, 27459), (1017, 21033), (1107, 19323), (1539, 13899), (2147, 9963), (2337, 9153), (3051, 7011), (3321, 6441), (4617, 4633)]