21085785

素因数分解:

$3^3\times 5^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{421}}^1$

素因数の和:495

約数の個数: 64

約数和(自身を含む): 43752960

約数和(自身を除く): 22667175

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 53, 63, 105, 135, 159, 189, 265, 315, 371, 421, 477, 795, 945, 1113, 1263, 1431, 1855, 2105, 2385, 2947, 3339, 3789, 5565, 6315, 7155, 8841, 10017, 11367, 14735, 16695, 18945, 22313, 26523, 44205, 50085, 56835, 66939, 79569, 111565, 132615, 156191, 200817, 334695, 397845, 468573, 602451, 780955, 1004085, 1405719, 2342865, 3012255, 4217157, 7028595, 21085785]

約数ペア:

[(1, 21085785), (3, 7028595), (5, 4217157), (7, 3012255), (9, 2342865), (15, 1405719), (21, 1004085), (27, 780955), (35, 602451), (45, 468573), (53, 397845), (63, 334695), (105, 200817), (135, 156191), (159, 132615), (189, 111565), (265, 79569), (315, 66939), (371, 56835), (421, 50085), (477, 44205), (795, 26523), (945, 22313), (1113, 18945), (1263, 16695), (1431, 14735), (1855, 11367), (2105, 10017), (2385, 8841), (2947, 7155), (3339, 6315), (3789, 5565)]