21498760

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{13109}}^1$

素因数の和:13161

約数の個数: 32

約数和(自身を含む): 49555800

約数和(自身を除く): 28057040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 13109, 26218, 52436, 65545, 104872, 131090, 262180, 524360, 537469, 1074938, 2149876, 2687345, 4299752, 5374690, 10749380, 21498760]

約数ペア:

[(1, 21498760), (2, 10749380), (4, 5374690), (5, 4299752), (8, 2687345), (10, 2149876), (20, 1074938), (40, 537469), (41, 524360), (82, 262180), (164, 131090), (205, 104872), (328, 65545), (410, 52436), (820, 26218), (1640, 13109)]