21865221

素因数分解:

$3^4\times 7^3\times {\mathrm{787}}^1$

素因数の和:820

約数の個数: 40

約数和(自身を含む): 38139200

約数和(自身を除く): 16273979

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 147, 189, 343, 441, 567, 787, 1029, 1323, 2361, 3087, 3969, 5509, 7083, 9261, 16527, 21249, 27783, 38563, 49581, 63747, 115689, 148743, 269941, 347067, 446229, 809823, 1041201, 2429469, 3123603, 7288407, 21865221]

約数ペア:

[(1, 21865221), (3, 7288407), (7, 3123603), (9, 2429469), (21, 1041201), (27, 809823), (49, 446229), (63, 347067), (81, 269941), (147, 148743), (189, 115689), (343, 63747), (441, 49581), (567, 38563), (787, 27783), (1029, 21249), (1323, 16527), (2361, 9261), (3087, 7083), (3969, 5509)]