21211491

素因数分解:

$3^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{6779}}^1$

素因数の和:6938

約数の個数: 16

約数和(自身を含む): 32544000

約数和(自身を除く): 11332509

約数列:

[1, 3, 7, 21, 149, 447, 1043, 3129, 6779, 20337, 47453, 142359, 1010071, 3030213, 7070497, 21211491]

約数ペア:

[(1, 21211491), (3, 7070497), (7, 3030213), (21, 1010071), (149, 142359), (447, 47453), (1043, 20337), (3129, 6779)]