21047915

素因数分解:

$5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{1021}}^1$

素因数の和:1083

約数の個数: 32

約数和(自身を含む): 31395840

約数和(自身を除く): 10347925

約数列:

[1, 5, 7, 19, 31, 35, 95, 133, 155, 217, 589, 665, 1021, 1085, 2945, 4123, 5105, 7147, 19399, 20615, 31651, 35735, 96995, 135793, 158255, 221557, 601369, 678965, 1107785, 3006845, 4209583, 21047915]

約数ペア:

[(1, 21047915), (5, 4209583), (7, 3006845), (19, 1107785), (31, 678965), (35, 601369), (95, 221557), (133, 158255), (155, 135793), (217, 96995), (589, 35735), (665, 31651), (1021, 20615), (1085, 19399), (2945, 7147), (4123, 5105)]