20681945

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{149}}^1$

素因数の和:265

約数の個数: 32

約数和(自身を含む): 27993600

約数和(自身を除く): 7311655

約数列:

[1, 5, 17, 23, 71, 85, 115, 149, 355, 391, 745, 1207, 1633, 1955, 2533, 3427, 6035, 8165, 10579, 12665, 17135, 27761, 52895, 58259, 138805, 179843, 243317, 291295, 899215, 1216585, 4136389, 20681945]

約数ペア:

[(1, 20681945), (5, 4136389), (17, 1216585), (23, 899215), (71, 291295), (85, 243317), (115, 179843), (149, 138805), (355, 58259), (391, 52895), (745, 27761), (1207, 17135), (1633, 12665), (1955, 10579), (2533, 8165), (3427, 6035)]