21897785

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{149}}^1$

素因数の和:210

約数の個数: 64

約数和(自身を含む): 36288000

約数和(自身を除く): 14390215

約数列:

[1, 5, 7, 13, 17, 19, 35, 65, 85, 91, 95, 119, 133, 149, 221, 247, 323, 455, 595, 665, 745, 1043, 1105, 1235, 1547, 1615, 1729, 1937, 2261, 2533, 2831, 4199, 5215, 7735, 8645, 9685, 11305, 12665, 13559, 14155, 17731, 19817, 20995, 29393, 32929, 36803, 48127, 67795, 88655, 99085, 146965, 164645, 184015, 230503, 240635, 257621, 336889, 625651, 1152515, 1288105, 1684445, 3128255, 4379557, 21897785]

約数ペア:

[(1, 21897785), (5, 4379557), (7, 3128255), (13, 1684445), (17, 1288105), (19, 1152515), (35, 625651), (65, 336889), (85, 257621), (91, 240635), (95, 230503), (119, 184015), (133, 164645), (149, 146965), (221, 99085), (247, 88655), (323, 67795), (455, 48127), (595, 36803), (665, 32929), (745, 29393), (1043, 20995), (1105, 19817), (1235, 17731), (1547, 14155), (1615, 13559), (1729, 12665), (1937, 11305), (2261, 9685), (2533, 8645), (2831, 7735), (4199, 5215)]