20212745

素因数分解:

$5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{211}}^1$

素因数の和:270

約数の個数: 48

約数和(自身を含む): 31321728

約数和(自身を除く): 11108983

約数列:

[1, 5, 7, 17, 23, 35, 49, 85, 115, 119, 161, 211, 245, 391, 595, 805, 833, 1055, 1127, 1477, 1955, 2737, 3587, 4165, 4853, 5635, 7385, 10339, 13685, 17935, 19159, 24265, 25109, 33971, 51695, 82501, 95795, 125545, 169855, 175763, 237797, 412505, 577507, 878815, 1188985, 2887535, 4042549, 20212745]

約数ペア:

[(1, 20212745), (5, 4042549), (7, 2887535), (17, 1188985), (23, 878815), (35, 577507), (49, 412505), (85, 237797), (115, 175763), (119, 169855), (161, 125545), (211, 95795), (245, 82501), (391, 51695), (595, 33971), (805, 25109), (833, 24265), (1055, 19159), (1127, 17935), (1477, 13685), (1955, 10339), (2737, 7385), (3587, 5635), (4165, 4853)]