21378753

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{229}}^1$

素因数の和:310

約数の個数: 48

約数和(自身を含む): 36167040

約数和(自身を除く): 14788287

約数列:

[1, 3, 9, 11, 23, 33, 41, 69, 99, 123, 207, 229, 253, 369, 451, 687, 759, 943, 1353, 2061, 2277, 2519, 2829, 4059, 5267, 7557, 8487, 9389, 10373, 15801, 22671, 28167, 31119, 47403, 57937, 84501, 93357, 103279, 173811, 215947, 309837, 521433, 647841, 929511, 1943523, 2375417, 7126251, 21378753]

約数ペア:

[(1, 21378753), (3, 7126251), (9, 2375417), (11, 1943523), (23, 929511), (33, 647841), (41, 521433), (69, 309837), (99, 215947), (123, 173811), (207, 103279), (229, 93357), (253, 84501), (369, 57937), (451, 47403), (687, 31119), (759, 28167), (943, 22671), (1353, 15801), (2061, 10373), (2277, 9389), (2519, 8487), (2829, 7557), (4059, 5267)]