21139520

素因数分解:

$2^6\times 5^1\times {\mathrm{31}}^1\times {\mathrm{2131}}^1$

素因数の和:2179

約数の個数: 56

約数和(自身を含む): 51986688

約数和(自身を除く): 30847168

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 155, 160, 248, 310, 320, 496, 620, 992, 1240, 1984, 2131, 2480, 4262, 4960, 8524, 9920, 10655, 17048, 21310, 34096, 42620, 66061, 68192, 85240, 132122, 136384, 170480, 264244, 330305, 340960, 528488, 660610, 681920, 1056976, 1321220, 2113952, 2642440, 4227904, 5284880, 10569760, 21139520]

約数ペア:

[(1, 21139520), (2, 10569760), (4, 5284880), (5, 4227904), (8, 2642440), (10, 2113952), (16, 1321220), (20, 1056976), (31, 681920), (32, 660610), (40, 528488), (62, 340960), (64, 330305), (80, 264244), (124, 170480), (155, 136384), (160, 132122), (248, 85240), (310, 68192), (320, 66061), (496, 42620), (620, 34096), (992, 21310), (1240, 17048), (1984, 10655), (2131, 9920), (2480, 8524), (4262, 4960)]