21805407

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{577}}^1$

素因数の和:632

約数の個数: 48

約数和(自身を含む): 37870560

約数和(自身を除く): 16065153

約数列:

[1, 3, 9, 13, 17, 19, 39, 51, 57, 117, 153, 171, 221, 247, 323, 577, 663, 741, 969, 1731, 1989, 2223, 2907, 4199, 5193, 7501, 9809, 10963, 12597, 22503, 29427, 32889, 37791, 67509, 88281, 98667, 127517, 142519, 186371, 382551, 427557, 559113, 1147653, 1282671, 1677339, 2422823, 7268469, 21805407]

約数ペア:

[(1, 21805407), (3, 7268469), (9, 2422823), (13, 1677339), (17, 1282671), (19, 1147653), (39, 559113), (51, 427557), (57, 382551), (117, 186371), (153, 142519), (171, 127517), (221, 98667), (247, 88281), (323, 67509), (577, 37791), (663, 32889), (741, 29427), (969, 22503), (1731, 12597), (1989, 10963), (2223, 9809), (2907, 7501), (4199, 5193)]