21513213

素因数分解:

$3^2\times {\mathrm{71}}^1\times {\mathrm{131}}^1\times {\mathrm{257}}^1$

素因数の和:465

約数の個数: 24

約数和(自身を含む): 31876416

約数和(自身を除く): 10363203

約数列:

[1, 3, 9, 71, 131, 213, 257, 393, 639, 771, 1179, 2313, 9301, 18247, 27903, 33667, 54741, 83709, 101001, 164223, 303003, 2390357, 7171071, 21513213]

約数ペア:

[(1, 21513213), (3, 7171071), (9, 2390357), (71, 303003), (131, 164223), (213, 101001), (257, 83709), (393, 54741), (639, 33667), (771, 27903), (1179, 18247), (2313, 9301)]