21802781

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{947}}^1$

素因数の和:1001

約数の個数: 32

約数和(自身を含む): 30578688

約数和(自身を除く): 8775907

約数列:

[1, 7, 11, 13, 23, 77, 91, 143, 161, 253, 299, 947, 1001, 1771, 2093, 3289, 6629, 10417, 12311, 21781, 23023, 72919, 86177, 135421, 152467, 239591, 283153, 947947, 1677137, 1982071, 3114683, 21802781]

約数ペア:

[(1, 21802781), (7, 3114683), (11, 1982071), (13, 1677137), (23, 947947), (77, 283153), (91, 239591), (143, 152467), (161, 135421), (253, 86177), (299, 72919), (947, 23023), (1001, 21781), (1771, 12311), (2093, 10417), (3289, 6629)]