21287451

素因数分解:

$3^1\times {\mathrm{17}}^2\times {\mathrm{43}}^1\times {\mathrm{571}}^1$

素因数の和:651

約数の個数: 24

約数和(自身を含む): 30906304

約数和(自身を除く): 9618853

約数列:

[1, 3, 17, 43, 51, 129, 289, 571, 731, 867, 1713, 2193, 9707, 12427, 24553, 29121, 37281, 73659, 165019, 417401, 495057, 1252203, 7095817, 21287451]

約数ペア:

[(1, 21287451), (3, 7095817), (17, 1252203), (43, 495057), (51, 417401), (129, 165019), (289, 73659), (571, 37281), (731, 29121), (867, 24553), (1713, 12427), (2193, 9707)]