20654319

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{257}}^1$

素因数の和:399

約数の個数: 32

約数和(自身を含む): 32693760

約数和(自身を除く): 12039441

約数列:

[1, 3, 7, 21, 43, 89, 129, 257, 267, 301, 623, 771, 903, 1799, 1869, 3827, 5397, 11051, 11481, 22873, 26789, 33153, 68619, 77357, 80367, 160111, 232071, 480333, 983539, 2950617, 6884773, 20654319]

約数ペア:

[(1, 20654319), (3, 6884773), (7, 2950617), (21, 983539), (43, 480333), (89, 232071), (129, 160111), (257, 80367), (267, 77357), (301, 68619), (623, 33153), (771, 26789), (903, 22873), (1799, 11481), (1869, 11051), (3827, 5397)]