21702009

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{499}}^1$

素因数の和:637

約数の個数: 32

約数和(自身を含む): 35200000

約数和(自身を除く): 13497991

約数列:

[1, 3, 7, 19, 21, 57, 109, 133, 327, 399, 499, 763, 1497, 2071, 2289, 3493, 6213, 9481, 10479, 14497, 28443, 43491, 54391, 66367, 163173, 199101, 380737, 1033429, 1142211, 3100287, 7234003, 21702009]

約数ペア:

[(1, 21702009), (3, 7234003), (7, 3100287), (19, 1142211), (21, 1033429), (57, 380737), (109, 199101), (133, 163173), (327, 66367), (399, 54391), (499, 43491), (763, 28443), (1497, 14497), (2071, 10479), (2289, 9481), (3493, 6213)]