21280415

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{59}}^1\times {\mathrm{179}}^1$

素因数の和:287

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 7749985

約数列:

[1, 5, 13, 31, 59, 65, 155, 179, 295, 403, 767, 895, 1829, 2015, 2327, 3835, 5549, 9145, 10561, 11635, 23777, 27745, 52805, 72137, 118885, 137293, 327391, 360685, 686465, 1636955, 4256083, 21280415]

約数ペア:

[(1, 21280415), (5, 4256083), (13, 1636955), (31, 686465), (59, 360685), (65, 327391), (155, 137293), (179, 118885), (295, 72137), (403, 52805), (767, 27745), (895, 23777), (1829, 11635), (2015, 10561), (2327, 9145), (3835, 5549)]