21587553

素因数分解:

$3^4\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{83}}^1$

素因数の和:140

約数の個数: 60

約数和(自身を含む): 37200240

約数和(自身を除く): 15612687

約数列:

[1, 3, 9, 13, 19, 27, 39, 57, 81, 83, 117, 169, 171, 247, 249, 351, 507, 513, 741, 747, 1053, 1079, 1521, 1539, 1577, 2223, 2241, 3211, 3237, 4563, 4731, 6669, 6723, 9633, 9711, 13689, 14027, 14193, 20007, 20501, 28899, 29133, 42081, 42579, 61503, 86697, 87399, 126243, 127737, 184509, 260091, 266513, 378729, 553527, 799539, 1136187, 1660581, 2398617, 7195851, 21587553]

約数ペア:

[(1, 21587553), (3, 7195851), (9, 2398617), (13, 1660581), (19, 1136187), (27, 799539), (39, 553527), (57, 378729), (81, 266513), (83, 260091), (117, 184509), (169, 127737), (171, 126243), (247, 87399), (249, 86697), (351, 61503), (507, 42579), (513, 42081), (741, 29133), (747, 28899), (1053, 20501), (1079, 20007), (1521, 14193), (1539, 14027), (1577, 13689), (2223, 9711), (2241, 9633), (3211, 6723), (3237, 6669), (4563, 4731)]