396800420

素因数分解:

$2^2\times 5^1\times {\mathrm{19840021}}^1$

素因数の和:19840030

約数の個数: 12

約数和(自身を含む): 833280924

約数和(自身を除く): 436480504

約数列:

[1, 2, 4, 5, 10, 20, 19840021, 39680042, 79360084, 99200105, 198400210, 396800420]

約数ペア:

[(1, 396800420), (2, 198400210), (4, 99200105), (5, 79360084), (10, 39680042), (20, 19840021)]