21018865

素因数分解:

$5^1\times 7^1\times {\mathrm{223}}^1\times {\mathrm{2693}}^1$

素因数の和:2928

約数の個数: 16

約数和(自身を含む): 28965888

約数和(自身を除く): 7947023

約数列:

[1, 5, 7, 35, 223, 1115, 1561, 2693, 7805, 13465, 18851, 94255, 600539, 3002695, 4203773, 21018865]

約数ペア:

[(1, 21018865), (5, 4203773), (7, 3002695), (35, 600539), (223, 94255), (1115, 18851), (1561, 13465), (2693, 7805)]