21021315

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{257}}^1$

素因数の和:332

約数の個数: 64

約数和(自身を含む): 41610240

約数和(自身を除く): 20588925

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 41, 57, 95, 105, 123, 133, 205, 257, 285, 287, 399, 615, 665, 771, 779, 861, 1285, 1435, 1799, 1995, 2337, 3855, 3895, 4305, 4883, 5397, 5453, 8995, 10537, 11685, 14649, 16359, 24415, 26985, 27265, 31611, 34181, 52685, 73245, 73759, 81795, 102543, 158055, 170905, 200203, 221277, 368795, 512715, 600609, 1001015, 1106385, 1401421, 3003045, 4204263, 7007105, 21021315]

約数ペア:

[(1, 21021315), (3, 7007105), (5, 4204263), (7, 3003045), (15, 1401421), (19, 1106385), (21, 1001015), (35, 600609), (41, 512715), (57, 368795), (95, 221277), (105, 200203), (123, 170905), (133, 158055), (205, 102543), (257, 81795), (285, 73759), (287, 73245), (399, 52685), (615, 34181), (665, 31611), (771, 27265), (779, 26985), (861, 24415), (1285, 16359), (1435, 14649), (1799, 11685), (1995, 10537), (2337, 8995), (3855, 5453), (3895, 5397), (4305, 4883)]