21379815

素因数分解:

$3^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{127}}^1$

素因数の和:213

約数の個数: 64

約数和(自身を含む): 40550400

約数和(自身を除く): 19170585

約数列:

[1, 3, 5, 9, 15, 27, 29, 43, 45, 87, 127, 129, 135, 145, 215, 261, 381, 387, 435, 635, 645, 783, 1143, 1161, 1247, 1305, 1905, 1935, 3429, 3683, 3741, 3915, 5461, 5715, 5805, 6235, 11049, 11223, 16383, 17145, 18415, 18705, 27305, 33147, 33669, 49149, 55245, 56115, 81915, 99441, 147447, 158369, 165735, 168345, 245745, 475107, 497205, 737235, 791845, 1425321, 2375535, 4275963, 7126605, 21379815]

約数ペア:

[(1, 21379815), (3, 7126605), (5, 4275963), (9, 2375535), (15, 1425321), (27, 791845), (29, 737235), (43, 497205), (45, 475107), (87, 245745), (127, 168345), (129, 165735), (135, 158369), (145, 147447), (215, 99441), (261, 81915), (381, 56115), (387, 55245), (435, 49149), (635, 33669), (645, 33147), (783, 27305), (1143, 18705), (1161, 18415), (1247, 17145), (1305, 16383), (1905, 11223), (1935, 11049), (3429, 6235), (3683, 5805), (3741, 5715), (3915, 5461)]