21377235

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{131}}^1$

素因数の和:216

約数の個数: 64

約数和(自身を含む): 40144896

約数和(自身を除く): 18767661

約数列:

[1, 3, 5, 11, 15, 23, 33, 43, 55, 69, 115, 129, 131, 165, 215, 253, 345, 393, 473, 645, 655, 759, 989, 1265, 1419, 1441, 1965, 2365, 2967, 3013, 3795, 4323, 4945, 5633, 7095, 7205, 9039, 10879, 14835, 15065, 16899, 21615, 28165, 32637, 33143, 45195, 54395, 61963, 84495, 99429, 129559, 163185, 165715, 185889, 309815, 388677, 497145, 647795, 929445, 1425149, 1943385, 4275447, 7125745, 21377235]

約数ペア:

[(1, 21377235), (3, 7125745), (5, 4275447), (11, 1943385), (15, 1425149), (23, 929445), (33, 647795), (43, 497145), (55, 388677), (69, 309815), (115, 185889), (129, 165715), (131, 163185), (165, 129559), (215, 99429), (253, 84495), (345, 61963), (393, 54395), (473, 45195), (645, 33143), (655, 32637), (759, 28165), (989, 21615), (1265, 16899), (1419, 15065), (1441, 14835), (1965, 10879), (2365, 9039), (2967, 7205), (3013, 7095), (3795, 5633), (4323, 4945)]