21254520

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25303}}^1$

素因数の和:25324

約数の個数: 64

約数和(自身を含む): 72875520

約数和(自身を除く): 51621000

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25303, 50606, 75909, 101212, 126515, 151818, 177121, 202424, 253030, 303636, 354242, 379545, 506060, 531363, 607272, 708484, 759090, 885605, 1012120, 1062726, 1416968, 1518180, 1771210, 2125452, 2656815, 3036360, 3542420, 4250904, 5313630, 7084840, 10627260, 21254520]

約数ペア:

[(1, 21254520), (2, 10627260), (3, 7084840), (4, 5313630), (5, 4250904), (6, 3542420), (7, 3036360), (8, 2656815), (10, 2125452), (12, 1771210), (14, 1518180), (15, 1416968), (20, 1062726), (21, 1012120), (24, 885605), (28, 759090), (30, 708484), (35, 607272), (40, 531363), (42, 506060), (56, 379545), (60, 354242), (70, 303636), (84, 253030), (105, 202424), (120, 177121), (140, 151818), (168, 126515), (210, 101212), (280, 75909), (420, 50606), (840, 25303)]