21905821

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{359}}^1\times {\mathrm{379}}^1$

素因数の和:768

約数の個数: 16

約数和(自身を含む): 26265600

約数和(自身を除く): 4359779

約数列:

[1, 7, 23, 161, 359, 379, 2513, 2653, 8257, 8717, 57799, 61019, 136061, 952427, 3129403, 21905821]

約数ペア:

[(1, 21905821), (7, 3129403), (23, 952427), (161, 136061), (359, 61019), (379, 57799), (2513, 8717), (2653, 8257)]