21865557

素因数分解:

$3^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{107}}^1\times {\mathrm{263}}^1$

素因数の和:417

約数の個数: 32

約数和(自身を含む): 34670592

約数和(自身を除く): 12805035

約数列:

[1, 3, 7, 21, 37, 107, 111, 259, 263, 321, 749, 777, 789, 1841, 2247, 3959, 5523, 9731, 11877, 27713, 28141, 29193, 68117, 83139, 84423, 196987, 204351, 590961, 1041217, 3123651, 7288519, 21865557]

約数ペア:

[(1, 21865557), (3, 7288519), (7, 3123651), (21, 1041217), (37, 590961), (107, 204351), (111, 196987), (259, 84423), (263, 83139), (321, 68117), (749, 29193), (777, 28141), (789, 27713), (1841, 11877), (2247, 9731), (3959, 5523)]