21052405

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{67}}^1\times {\mathrm{197}}^1$

素因数の和:309

約数の個数: 32

約数和(自身を含む): 29082240

約数和(自身を除く): 8029835

約数列:

[1, 5, 11, 29, 55, 67, 145, 197, 319, 335, 737, 985, 1595, 1943, 2167, 3685, 5713, 9715, 10835, 13199, 21373, 28565, 62843, 65995, 106865, 145189, 314215, 382771, 725945, 1913855, 4210481, 21052405]

約数ペア:

[(1, 21052405), (5, 4210481), (11, 1913855), (29, 725945), (55, 382771), (67, 314215), (145, 145189), (197, 106865), (319, 65995), (335, 62843), (737, 28565), (985, 21373), (1595, 13199), (1943, 10835), (2167, 9715), (3685, 5713)]