21293745

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{181}}^1$

素因数の和:254

約数の個数: 64

約数和(自身を含む): 40255488

約数和(自身を除く): 18961743

約数列:

[1, 3, 5, 11, 15, 23, 31, 33, 55, 69, 93, 115, 155, 165, 181, 253, 341, 345, 465, 543, 713, 759, 905, 1023, 1265, 1705, 1991, 2139, 2715, 3565, 3795, 4163, 5115, 5611, 5973, 7843, 9955, 10695, 12489, 16833, 20815, 23529, 28055, 29865, 39215, 45793, 61721, 62445, 84165, 117645, 129053, 137379, 185163, 228965, 308605, 387159, 645265, 686895, 925815, 1419583, 1935795, 4258749, 7097915, 21293745]

約数ペア:

[(1, 21293745), (3, 7097915), (5, 4258749), (11, 1935795), (15, 1419583), (23, 925815), (31, 686895), (33, 645265), (55, 387159), (69, 308605), (93, 228965), (115, 185163), (155, 137379), (165, 129053), (181, 117645), (253, 84165), (341, 62445), (345, 61721), (465, 45793), (543, 39215), (713, 29865), (759, 28055), (905, 23529), (1023, 20815), (1265, 16833), (1705, 12489), (1991, 10695), (2139, 9955), (2715, 7843), (3565, 5973), (3795, 5611), (4163, 5115)]