21891515

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{233}}^1$

素因数の和:323

約数の個数: 32

約数和(自身を含む): 29652480

約数和(自身を除く): 7760965

約数列:

[1, 5, 19, 23, 43, 95, 115, 215, 233, 437, 817, 989, 1165, 2185, 4085, 4427, 4945, 5359, 10019, 18791, 22135, 26795, 50095, 93955, 101821, 190361, 230437, 509105, 951805, 1152185, 4378303, 21891515]

約数ペア:

[(1, 21891515), (5, 4378303), (19, 1152185), (23, 951805), (43, 509105), (95, 230437), (115, 190361), (215, 101821), (233, 93955), (437, 50095), (817, 26795), (989, 22135), (1165, 18791), (2185, 10019), (4085, 5359), (4427, 4945)]