21012765

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{4337}}^1$

素因数の和:4381

約数の個数: 32

約数和(自身を含む): 37480320

約数和(自身を除く): 16467555

約数列:

[1, 3, 5, 15, 17, 19, 51, 57, 85, 95, 255, 285, 323, 969, 1615, 4337, 4845, 13011, 21685, 65055, 73729, 82403, 221187, 247209, 368645, 412015, 1105935, 1236045, 1400851, 4202553, 7004255, 21012765]

約数ペア:

[(1, 21012765), (3, 7004255), (5, 4202553), (15, 1400851), (17, 1236045), (19, 1105935), (51, 412015), (57, 368645), (85, 247209), (95, 221187), (255, 82403), (285, 73729), (323, 65055), (969, 21685), (1615, 13011), (4337, 4845)]