21397851

素因数分解:

$3^5\times {\mathrm{173}}^1\times {\mathrm{509}}^1$

素因数の和:697

約数の個数: 24

約数和(自身を含む): 32301360

約数和(自身を除く): 10903509

約数列:

[1, 3, 9, 27, 81, 173, 243, 509, 519, 1527, 1557, 4581, 4671, 13743, 14013, 41229, 42039, 88057, 123687, 264171, 792513, 2377539, 7132617, 21397851]

約数ペア:

[(1, 21397851), (3, 7132617), (9, 2377539), (27, 792513), (81, 264171), (173, 123687), (243, 88057), (509, 42039), (519, 41229), (1527, 14013), (1557, 13743), (4581, 4671)]