20010221

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{101}}^1$

素因数の和:233

約数の個数: 32

約数和(自身を含む): 26320896

約数和(自身を除く): 6310675

約数列:

[1, 7, 11, 31, 77, 83, 101, 217, 341, 581, 707, 913, 1111, 2387, 2573, 3131, 6391, 7777, 8383, 18011, 21917, 28303, 34441, 58681, 92213, 198121, 241087, 259873, 645491, 1819111, 2858603, 20010221]

約数ペア:

[(1, 20010221), (7, 2858603), (11, 1819111), (31, 645491), (77, 259873), (83, 241087), (101, 198121), (217, 92213), (341, 58681), (581, 34441), (707, 28303), (913, 21917), (1111, 18011), (2387, 8383), (2573, 7777), (3131, 6391)]