21551751

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{211}}^1$

素因数の和:333

約数の個数: 40

約数和(自身を含む): 35194544

約数和(自身を除く): 13642793

約数列:

[1, 3, 9, 13, 27, 39, 81, 97, 117, 211, 291, 351, 633, 873, 1053, 1261, 1899, 2619, 2743, 3783, 5697, 7857, 8229, 11349, 17091, 20467, 24687, 34047, 61401, 74061, 102141, 184203, 222183, 266071, 552609, 798213, 1657827, 2394639, 7183917, 21551751]

約数ペア:

[(1, 21551751), (3, 7183917), (9, 2394639), (13, 1657827), (27, 798213), (39, 552609), (81, 266071), (97, 222183), (117, 184203), (211, 102141), (291, 74061), (351, 61401), (633, 34047), (873, 24687), (1053, 20467), (1261, 17091), (1899, 11349), (2619, 8229), (2743, 7857), (3783, 5697)]