19800781

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{151}}^1$

素因数の和:313

約数の個数: 32

約数和(自身を含む): 26966016

約数和(自身を除く): 7165235

約数列:

[1, 7, 11, 13, 77, 91, 131, 143, 151, 917, 1001, 1057, 1441, 1661, 1703, 1963, 10087, 11627, 11921, 13741, 18733, 19781, 21593, 131131, 138467, 151151, 217591, 257153, 1523137, 1800071, 2828683, 19800781]

約数ペア:

[(1, 19800781), (7, 2828683), (11, 1800071), (13, 1523137), (77, 257153), (91, 217591), (131, 151151), (143, 138467), (151, 131131), (917, 21593), (1001, 19781), (1057, 18733), (1441, 13741), (1661, 11921), (1703, 11627), (1963, 10087)]