21238640

素因数分解:

$2^4\times 5^1\times {\mathrm{265483}}^1$

素因数の和:265496

約数の個数: 20

約数和(自身を含む): 49380024

約数和(自身を除く): 28141384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265483, 530966, 1061932, 1327415, 2123864, 2654830, 4247728, 5309660, 10619320, 21238640]

約数ペア:

[(1, 21238640), (2, 10619320), (4, 5309660), (5, 4247728), (8, 2654830), (10, 2123864), (16, 1327415), (20, 1061932), (40, 530966), (80, 265483)]