21989211

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{271}}^1$

素因数の和:371

約数の個数: 32

約数和(自身を含む): 32744448

約数和(自身を除く): 10755237

約数列:

[1, 3, 17, 37, 43, 51, 111, 129, 271, 629, 731, 813, 1591, 1887, 2193, 4607, 4773, 10027, 11653, 13821, 27047, 30081, 34959, 81141, 170459, 198101, 431161, 511377, 594303, 1293483, 7329737, 21989211]

約数ペア:

[(1, 21989211), (3, 7329737), (17, 1293483), (37, 594303), (43, 511377), (51, 431161), (111, 198101), (129, 170459), (271, 81141), (629, 34959), (731, 30081), (813, 27047), (1591, 13821), (1887, 11653), (2193, 10027), (4607, 4773)]