21221893

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^2\times {\mathrm{521}}^1$

素因数の和:585

約数の個数: 24

約数和(自身を含む): 27711936

約数和(自身を除く): 6490043

約数列:

[1, 7, 11, 23, 77, 161, 253, 521, 529, 1771, 3647, 3703, 5731, 5819, 11983, 40117, 40733, 83881, 131813, 275609, 922691, 1929263, 3031699, 21221893]

約数ペア:

[(1, 21221893), (7, 3031699), (11, 1929263), (23, 922691), (77, 275609), (161, 131813), (253, 83881), (521, 40733), (529, 40117), (1771, 11983), (3647, 5819), (3703, 5731)]